diff --git a/README.md b/README.md
index b6a16c40b3..bf0f158992 100755
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ sttp (v2) documentation is available at [sttp.softwaremill.com/en/v2](https://st
 
 sttp (v1) documentation is available at [sttp.softwaremill.com/en/v1](https://sttp.softwaremill.com/en/v1).
 
-scaladoc is available at [https://www.javadoc.io](https://www.javadoc.io/doc/com.softwaremill.sttp.client4/core_2.12/4.0.0-M8)
+scaladoc is available at [https://www.javadoc.io](https://www.javadoc.io/doc/com.softwaremill.sttp.client4/core_2.12/4.0.0-M9)
 
 ## Quickstart with scala-cli
 
@@ -56,7 +56,7 @@ Add the following directive to the top of your scala file to add the core sttp d
 If you are using [scala-cli](https://scala-cli.virtuslab.org), you can quickly start experimenting with sttp by copy-pasting the following:
 
 ```
-//> using lib "com.softwaremill.sttp.client4::core:4.0.0-M8"
+//> using lib "com.softwaremill.sttp.client4::core:4.0.0-M9"
 import sttp.client4.quick._
 quickRequest.get(uri"http://httpbin.org/ip").send()
 ```
@@ -68,7 +68,7 @@ The `quick` package import brings in the sttp API and a pre-configured, global s
 Similarly, using [Ammonite](http://ammonite.io):
 
 ```scala
-import $ivy.`com.softwaremill.sttp.client4::core:4.0.0-M8`
+import $ivy.`com.softwaremill.sttp.client4::core:4.0.0-M9`
 import sttp.client4.quick._
 quickRequest.get(uri"http://httpbin.org/ip").send()
 ```
@@ -78,7 +78,7 @@ quickRequest.get(uri"http://httpbin.org/ip").send()
 Add the following dependency:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9"
 ```
 
 Then, import:
@@ -133,7 +133,7 @@ The documentation is typechecked using [mdoc](https://scalameta.org/mdoc/). The
 
 When generating documentation, it's best to set the version to the current one, so that the generated doc files don't include modifications with the current snapshot version. 
 
-That is, in sbt run: `set version := "4.0.0-M8"`, before running `mdoc` in `docs`.
+That is, in sbt run: `set version := "4.0.0-M9"`, before running `mdoc` in `docs`.
 
 ### Testing the Scala.JS backend
 
@@ -160,4 +160,4 @@ We offer commercial support for sttp and related technologies, as well as develo
 
 ## Copyright
 
-Copyright (C) 2017-2023 SoftwareMill [https://softwaremill.com](https://softwaremill.com).
+Copyright (C) 2017-2024 SoftwareMill [https://softwaremill.com](https://softwaremill.com).
diff --git a/build.sbt b/build.sbt
index f82296eff4..5059bb0727 100644
--- a/build.sbt
+++ b/build.sbt
@@ -121,13 +121,13 @@ val testServerSettings = Seq(
 
 val circeVersion: String = "0.14.6"
 
-val jsoniterVersion = "2.25.0"
+val jsoniterVersion = "2.27.2"
 
-val play29JsonVersion = "2.10.3"
+val play29JsonVersion = "2.10.4"
 
-val playJsonVersion = "3.0.1"
+val playJsonVersion = "3.0.2"
 
-val catsEffect_3_version = "3.5.2"
+val catsEffect_3_version = "3.5.3"
 val fs2_3_version = "3.9.4"
 
 val catsEffect_2_version = "2.5.5"
@@ -138,32 +138,32 @@ val akkaHttp = "com.typesafe.akka" %% "akka-http" % "10.2.10"
 val akkaStreamVersion = "2.6.20"
 val akkaStreams = "com.typesafe.akka" %% "akka-stream" % akkaStreamVersion
 
-val pekkoHttp = "org.apache.pekko" %% "pekko-http" % "1.0.0"
+val pekkoHttp = "org.apache.pekko" %% "pekko-http" % "1.0.1"
 val pekkoStreamVersion = "1.0.2"
 val pekkoStreams = "org.apache.pekko" %% "pekko-stream" % pekkoStreamVersion
 
 val scalaTest = libraryDependencies ++= Seq("freespec", "funsuite", "flatspec", "wordspec", "shouldmatchers").map(m =>
-  "org.scalatest" %%% s"scalatest-$m" % "3.2.17" % Test
+  "org.scalatest" %%% s"scalatest-$m" % "3.2.18" % Test
 )
 
 val zio1Version = "1.0.18"
-val zio2Version = "2.0.19"
+val zio2Version = "2.0.21"
 val zio1InteropRsVersion = "1.3.12"
 val zio2InteropRsVersion = "2.0.2"
 
 val sttpModelVersion = "1.7.6"
 val sttpSharedVersion = "1.3.17"
 
-val logback = "ch.qos.logback" % "logback-classic" % "1.4.14"
+val logback = "ch.qos.logback" % "logback-classic" % "1.5.0"
 
 val jeagerClientVersion = "1.8.1"
-val braveOpentracingVersion = "1.0.0"
+val braveOpentracingVersion = "1.0.1"
 val zipkinSenderOkHttpVersion = "2.16.5"
-val resilience4jVersion = "2.1.0"
+val resilience4jVersion = "2.2.0"
 val http4s_ce2_version = "0.22.15"
 val http4s_ce3_version = "0.23.24"
 
-val openTelemetryVersion = "1.33.0"
+val openTelemetryVersion = "1.35.0"
 
 val compileAndTest = "compile->compile;test->test"
 
@@ -676,7 +676,7 @@ lazy val http4sBackend = (projectMatrix in file("http4s-backend"))
     libraryDependencies ++= Seq(
       "org.http4s" %% "http4s-client" % http4s_ce3_version,
       "org.http4s" %% "http4s-ember-client" % "0.23.24" % Optional,
-      "org.http4s" %% "http4s-blaze-client" % "0.23.15" % Optional
+      "org.http4s" %% "http4s-blaze-client" % "0.23.16" % Optional
     ),
     evictionErrorLevel := Level.Info
   )
@@ -701,7 +701,7 @@ lazy val armeriaBackend = (projectMatrix in file("armeria-backend"))
   .settings(testServerSettings)
   .settings(
     name := "armeria-backend",
-    libraryDependencies += "com.linecorp.armeria" % "armeria" % "1.26.4"
+    libraryDependencies += "com.linecorp.armeria" % "armeria" % "1.27.1"
   )
   .jvmPlatform(scalaVersions = scala2 ++ scala3)
   .dependsOn(core % compileAndTest)
@@ -847,7 +847,7 @@ lazy val upickle = (projectMatrix in file("json/upickle"))
   .settings(
     name := "upickle",
     libraryDependencies ++= Seq(
-      "com.lihaoyi" %%% "upickle" % "3.1.3"
+      "com.lihaoyi" %%% "upickle" % "3.1.4"
     ),
     scalaTest,
     // using macroRW causes a "match may not be exhaustive" error
diff --git a/core/src/main/scalajs/sttp/client4/fetch/AbstractFetchBackend.scala b/core/src/main/scalajs/sttp/client4/fetch/AbstractFetchBackend.scala
index af09ce1a9e..17532b4817 100644
--- a/core/src/main/scalajs/sttp/client4/fetch/AbstractFetchBackend.scala
+++ b/core/src/main/scalajs/sttp/client4/fetch/AbstractFetchBackend.scala
@@ -84,20 +84,21 @@ abstract class AbstractFetchBackend[F[_], S <: Streams[S]](
   private def sendRegular[T](request: GenericRequest[T, R]): F[Response[T]] = {
     // https://stackoverflow.com/q/31061838/4094860
     val readTimeout = request.options.readTimeout
-    val (signal, cancelTimeout) = readTimeout match {
+    val controller = new AbortController()
+    val signal = controller.signal
+    val cancelTimeout = readTimeout match {
       case timeout: FiniteDuration =>
-        val controller = new AbortController()
-        val signal = controller.signal
-
         val timeoutHandle = setTimeout(timeout) {
           controller.abort()
         }
-        (Some(signal), () => clearTimeout(timeoutHandle))
+        () => clearTimeout(timeoutHandle)
 
       case _ =>
-        (None, () => ())
+        () => ()
     }
 
+    val cancel = () => controller.abort()
+
     val rheaders = new JSHeaders()
     request.headers.foreach { header =>
       // for multipart/form-data requests dom.FormData is responsible for setting the Content-Type header
@@ -113,7 +114,7 @@ abstract class AbstractFetchBackend[F[_], S <: Streams[S]](
     val req = createBody(request.body).map { rbody =>
       // use manual so we can return a specific error instead of the generic "TypeError: Failed to fetch"
       val rredirect = if (request.options.followRedirects) RequestRedirect.follow else RequestRedirect.manual
-      val rsignal = signal.orUndefined
+      val rsignal = signal
 
       val requestInitStatic = new RequestInit() {
         this.method = request.method.method.asInstanceOf[HttpMethod]
@@ -132,7 +133,7 @@ abstract class AbstractFetchBackend[F[_], S <: Streams[S]](
       }
 
       val requestInitDynamic = requestInitStatic.asInstanceOf[js.Dynamic]
-      signal.foreach(s => requestInitDynamic.updateDynamic("signal")(s))
+      requestInitDynamic.updateDynamic("signal")(signal)
       requestInitDynamic.updateDynamic("redirect")(rredirect) // named wrong in RequestInit
       val requestInit = requestInitDynamic.asInstanceOf[RequestInit]
 
@@ -165,10 +166,10 @@ abstract class AbstractFetchBackend[F[_], S <: Streams[S]](
           )
         }
       }
-    addCancelTimeoutHook(result, cancelTimeout)
+    addCancelTimeoutHook(result, cancel, cancelTimeout)
   }
 
-  protected def addCancelTimeoutHook[T](result: F[T], cancel: () => Unit): F[T]
+  protected def addCancelTimeoutHook[T](result: F[T], cancel: () => Unit, cleanup: () => Unit): F[T]
 
   private def convertResponseHeaders(headers: JSHeaders): Seq[Header] =
     headers
diff --git a/core/src/main/scalajs/sttp/client4/fetch/FetchBackend.scala b/core/src/main/scalajs/sttp/client4/fetch/FetchBackend.scala
index 912bf0379a..b776378eee 100644
--- a/core/src/main/scalajs/sttp/client4/fetch/FetchBackend.scala
+++ b/core/src/main/scalajs/sttp/client4/fetch/FetchBackend.scala
@@ -16,8 +16,12 @@ class FetchBackend private (fetchOptions: FetchOptions, customizeRequest: FetchR
 
   override val streams: NoStreams = NoStreams
 
-  override protected def addCancelTimeoutHook[T](result: Future[T], cancel: () => Unit): Future[T] = {
-    result.onComplete(_ => cancel())
+  override protected def addCancelTimeoutHook[T](
+      result: Future[T],
+      cancel: () => Unit,
+      cleanup: () => Unit
+  ): Future[T] = {
+    result.onComplete(_ => cleanup())
     result
   }
 
diff --git a/docs/index.md b/docs/index.md
index 0e458a50a5..fa260588a4 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -33,7 +33,7 @@ println(response.header("Content-Length"))
 println(response.body)     
 ```
 
-For more examples, see the [usage examples](examples.md) section. To start using sttp client in your project, see the [quickstart](quickstart.md). Or, browse the documentation to find the topics that interest you the most!
+For more examples, see the [usage examples](examples.md) section. To start using sttp client in your project, see the [quickstart](quickstart.md). Or, browse the documentation to find the topics that interest you the most! ScalaDoc is available at [https://www.javadoc.io](https://www.javadoc.io/doc/com.softwaremill.sttp.client4/core_2.12/4.0.0-M9).
 
 ## Other sttp projects
 
@@ -56,7 +56,7 @@ Third party projects:
 
 ## Sponsors
 
-Development and maintenance of sttp client is sponsored by [SoftwareMill](https://softwaremill.com), a software development and consulting company. We help clients scale their business through software. Our areas of expertise include backends, distributed systems, blockchain, machine learning and data analytics.
+Development and maintenance of sttp client is sponsored by [SoftwareMill](https://softwaremill.com), a software development and consulting company. We help clients scale their business through software. Our areas of expertise include backends, distributed systems, machine learning, platform engineering and data analytics.
 
 [![](https://files.softwaremill.com/logo/logo.png "SoftwareMill")](https://softwaremill.com)
 
diff --git a/docs/model/uri.md b/docs/model/uri.md
index 5fa466e453..84e5d20d7c 100644
--- a/docs/model/uri.md
+++ b/docs/model/uri.md
@@ -35,7 +35,7 @@ import sttp.client4._
 // the embedded / is escaped
 println(uri"http://example.org/${"a/b"}")
 
-// the embedded / is not escaped
+// the literal / is not escaped
 println(uri"http://example.org/${"a"}/${"b"}")
 
 // the embedded : is not escaped
@@ -132,7 +132,7 @@ which is an ordinary `case class`, will contain a path segment with `a b`.
 
 When parsing, that includes creating URIs from constant strings e.g. `uri"http://example.com/a%20b"`, all of the 
 components are decoded and stored in this form. This means that `Uri` might **not** exactly preserve the original
-form, in which path segments or query parameters have been writte down (this might change in a future major release,
+form, in which path segments or query parameters have been written down (this might change in a future major release,
 though).
 
 When serialising the `Uri` back to a `String`, the code follows the escaping rules defined in 
@@ -156,4 +156,4 @@ println(uri"http://example.com?a=b/?c%26d".querySegmentsEncoding(Uri.QuerySegmen
 
 // compare to:
 println(uri"http://example.com?a=b/?c%26d")
-```
\ No newline at end of file
+```
diff --git a/effects/cats-ce2/src/main/scalajs/sttp/client4/impl/cats/FetchCatsBackend.scala b/effects/cats-ce2/src/main/scalajs/sttp/client4/impl/cats/FetchCatsBackend.scala
index d274cafa14..fa1d78fc5b 100644
--- a/effects/cats-ce2/src/main/scalajs/sttp/client4/impl/cats/FetchCatsBackend.scala
+++ b/effects/cats-ce2/src/main/scalajs/sttp/client4/impl/cats/FetchCatsBackend.scala
@@ -19,9 +19,10 @@ class FetchCatsBackend[F[_]: Concurrent: ContextShift] private (
 
   override val streams: NoStreams = NoStreams
 
-  override protected def addCancelTimeoutHook[T](result: F[T], cancel: () => Unit): F[T] = {
+  override protected def addCancelTimeoutHook[T](result: F[T], cancel: () => Unit, cleanup: () => Unit): F[T] = {
     val doCancel = Sync[F].delay(cancel())
-    result.guarantee(doCancel)
+    val doCleanup = Sync[F].delay(cleanup())
+    result.onCancel(doCancel).guarantee(doCleanup)
   }
 
   override protected def handleStreamBody(s: Nothing): F[js.UndefOr[BodyInit]] = s
diff --git a/effects/cats/src/main/scalajs/sttp/client4/impl/cats/FetchCatsBackend.scala b/effects/cats/src/main/scalajs/sttp/client4/impl/cats/FetchCatsBackend.scala
index 3a7fe31896..25a6861fd9 100644
--- a/effects/cats/src/main/scalajs/sttp/client4/impl/cats/FetchCatsBackend.scala
+++ b/effects/cats/src/main/scalajs/sttp/client4/impl/cats/FetchCatsBackend.scala
@@ -19,9 +19,10 @@ class FetchCatsBackend[F[_]: Async] private (
 
   override val streams: NoStreams = NoStreams
 
-  override protected def addCancelTimeoutHook[T](result: F[T], cancel: () => Unit): F[T] = {
+  override protected def addCancelTimeoutHook[T](result: F[T], cancel: () => Unit, cleanup: () => Unit): F[T] = {
     val doCancel = Async[F].delay(cancel())
-    result.guarantee(doCancel)
+    val doCleanup = Async[F].delay(cleanup())
+    result.onCancel(doCancel).guarantee(doCleanup)
   }
 
   override protected def handleStreamBody(s: Nothing): F[js.UndefOr[BodyInit]] = s
diff --git a/effects/monix/src/main/scalajs/sttp/client4/impl/monix/FetchMonixBackend.scala b/effects/monix/src/main/scalajs/sttp/client4/impl/monix/FetchMonixBackend.scala
index 63e702aabb..7b59bd2711 100644
--- a/effects/monix/src/main/scalajs/sttp/client4/impl/monix/FetchMonixBackend.scala
+++ b/effects/monix/src/main/scalajs/sttp/client4/impl/monix/FetchMonixBackend.scala
@@ -29,9 +29,10 @@ class FetchMonixBackend private (fetchOptions: FetchOptions, customizeRequest: F
 
   override val streams: MonixStreams = MonixStreams
 
-  override protected def addCancelTimeoutHook[T](result: Task[T], cancel: () => Unit): Task[T] = {
+  override protected def addCancelTimeoutHook[T](result: Task[T], cancel: () => Unit, cleanup: () => Unit): Task[T] = {
     val doCancel = Task.delay(cancel())
-    result.doOnCancel(doCancel).doOnFinish(_ => doCancel)
+    val doCleanup = Task.delay(cleanup())
+    result.doOnCancel(doCancel).doOnFinish(_ => doCleanup)
   }
 
   override protected def handleStreamBody(s: Observable[Array[Byte]]): Task[js.UndefOr[BodyInit]] = {
diff --git a/effects/zio/src/main/scalajs/sttp/client4/impl/zio/FetchZioBackend.scala b/effects/zio/src/main/scalajs/sttp/client4/impl/zio/FetchZioBackend.scala
index f357d6a82b..f59b99f9f1 100644
--- a/effects/zio/src/main/scalajs/sttp/client4/impl/zio/FetchZioBackend.scala
+++ b/effects/zio/src/main/scalajs/sttp/client4/impl/zio/FetchZioBackend.scala
@@ -32,9 +32,10 @@ class FetchZioBackend private (fetchOptions: FetchOptions, customizeRequest: Fet
 
   override val streams: ZioStreams = ZioStreams
 
-  override protected def addCancelTimeoutHook[T](result: Task[T], cancel: () => Unit): Task[T] = {
-    val doCancel = ZIO.attempt(cancel())
-    result.onInterrupt(doCancel.catchAll(_ => ZIO.unit)).tap(_ => doCancel)
+  override protected def addCancelTimeoutHook[T](result: Task[T], cancel: () => Unit, cleanup: () => Unit): Task[T] = {
+    val doCancel = ZIO.attempt(cancel()).ignore
+    val doCleanup = ZIO.attempt(cleanup()).ignore
+    result.onInterrupt(doCancel).onExit(_ => doCleanup)
   }
 
   override protected def handleStreamBody(s: Observable[Byte]): Task[js.UndefOr[BodyInit]] = {
diff --git a/effects/zio1/src/main/scalajs/sttp/client4/impl/zio/FetchZioBackend.scala b/effects/zio1/src/main/scalajs/sttp/client4/impl/zio/FetchZioBackend.scala
index 36c275bdce..8712d48c30 100644
--- a/effects/zio1/src/main/scalajs/sttp/client4/impl/zio/FetchZioBackend.scala
+++ b/effects/zio1/src/main/scalajs/sttp/client4/impl/zio/FetchZioBackend.scala
@@ -37,9 +37,10 @@ class FetchZioBackend private (fetchOptions: FetchOptions, customizeRequest: Fet
 
   override val streams: ZioStreams = ZioStreams
 
-  override protected def addCancelTimeoutHook[T](result: Task[T], cancel: () => Unit): Task[T] = {
-    val doCancel = ZIO.effect(cancel())
-    result.onInterrupt(doCancel.catchAll(_ => ZIO.unit)).tap(_ => doCancel)
+  override protected def addCancelTimeoutHook[T](result: Task[T], cancel: () => Unit, cleanup: () => Unit): Task[T] = {
+    val doCancel = ZIO.effect(cancel()).ignore
+    val doCleanup = ZIO.effect(cleanup()).ignore
+    result.onInterrupt(doCancel).onExit(_ => doCleanup)
   }
 
   override protected def handleStreamBody(s: Observable[Byte]): Task[js.UndefOr[BodyInit]] = {
diff --git a/generated-docs/out/backends/akka.md b/generated-docs/out/backends/akka.md
index b1dff5e184..f638b4372e 100644
--- a/generated-docs/out/backends/akka.md
+++ b/generated-docs/out/backends/akka.md
@@ -3,7 +3,7 @@
 This backend is based on [akka-http](http://doc.akka.io/docs/akka-http/current/scala/http/). To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "akka-http-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "akka-http-backend" % "4.0.0-M9"
 ```
 
 A fully **asynchronous** backend. Uses the `Future` effect to return responses. There are also [other `Future`-based backends](future.md), which don't depend on Akka. 
diff --git a/generated-docs/out/backends/catseffect.md b/generated-docs/out/backends/catseffect.md
index 98ea0a92be..5604609cc7 100644
--- a/generated-docs/out/backends/catseffect.md
+++ b/generated-docs/out/backends/catseffect.md
@@ -14,7 +14,7 @@ Also note that the [http4s](http4s.md) backend can also be created for a type im
 Firstly, add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "cats" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "cats" % "4.0.0-M9"
 ```
 
 Obtain a cats-effect `Resource` which creates the backend, and closes the thread pool after the resource is no longer used:
@@ -82,9 +82,9 @@ Creation of the backend can be done in two basic ways:
 Firstly, add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "armeria-backend-cats" % "4.0.0-M8" // for cats-effect 3.x
+"com.softwaremill.sttp.client4" %% "armeria-backend-cats" % "4.0.0-M9" // for cats-effect 3.x
 // or
-"com.softwaremill.sttp.client4" %% "armeria-backend-cats-ce2" % "4.0.0-M8" // for cats-effect 2.x
+"com.softwaremill.sttp.client4" %% "armeria-backend-cats-ce2" % "4.0.0-M9" // for cats-effect 2.x
 ```
 
 create client:
diff --git a/generated-docs/out/backends/finagle.md b/generated-docs/out/backends/finagle.md
index 351339818e..ccfdf1def0 100644
--- a/generated-docs/out/backends/finagle.md
+++ b/generated-docs/out/backends/finagle.md
@@ -3,7 +3,7 @@
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "finagle-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "finagle-backend" % "4.0.0-M9"
 ```
 
 Next you'll need to add an implicit value:
diff --git a/generated-docs/out/backends/fs2.md b/generated-docs/out/backends/fs2.md
index 1160461735..f99e036c68 100644
--- a/generated-docs/out/backends/fs2.md
+++ b/generated-docs/out/backends/fs2.md
@@ -12,9 +12,9 @@ Creation of the backend can be done in two basic ways:
 Firstly, add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "fs2" % "4.0.0-M8" // for cats-effect 3.x & fs2 3.x
+"com.softwaremill.sttp.client4" %% "fs2" % "4.0.0-M9" // for cats-effect 3.x & fs2 3.x
 // or 
-"com.softwaremill.sttp.client4" %% "fs2ce2" % "4.0.0-M8" // for cats-effect 2.x & fs2 2.x
+"com.softwaremill.sttp.client4" %% "fs2ce2" % "4.0.0-M9" // for cats-effect 2.x & fs2 2.x
 ```
 
 Obtain a cats-effect `Resource` which creates the backend, and closes the thread pool after the resource is no longer used:
@@ -78,9 +78,9 @@ Host header override is supported in environments running Java 12 onwards, but i
 To use, add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "armeria-backend-fs2" % "4.0.0-M8" // for cats-effect 3.x & fs2 3.x
+"com.softwaremill.sttp.client4" %% "armeria-backend-fs2" % "4.0.0-M9" // for cats-effect 3.x & fs2 3.x
 // or
-"com.softwaremill.sttp.client4" %% "armeria-backend-fs2" % "4.0.0-M8" // for cats-effect 2.x & fs2 2.x
+"com.softwaremill.sttp.client4" %% "armeria-backend-fs2" % "4.0.0-M9" // for cats-effect 2.x & fs2 2.x
 ```
 
 create client:
diff --git a/generated-docs/out/backends/future.md b/generated-docs/out/backends/future.md
index d216731be3..342f67df75 100644
--- a/generated-docs/out/backends/future.md
+++ b/generated-docs/out/backends/future.md
@@ -20,7 +20,7 @@ Class                                 Supported stream type
 To use, you don't need any extra dependencies, `core` is enough:
 
 ```
-"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9"
 ```
 
 You'll need the following imports:
@@ -59,7 +59,7 @@ Host header override is supported in environments running Java 12 onwards, but i
 To use, add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "okhttp-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "okhttp-backend" % "4.0.0-M9"
 ```
 
 and some imports:
@@ -91,7 +91,7 @@ This backend depends on [OkHttp](http://square.github.io/okhttp/) and fully supp
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "armeria-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "armeria-backend" % "4.0.0-M9"
 ```
 
 add imports:
diff --git a/generated-docs/out/backends/http4s.md b/generated-docs/out/backends/http4s.md
index 347af7ce2d..b5e2dd1edc 100644
--- a/generated-docs/out/backends/http4s.md
+++ b/generated-docs/out/backends/http4s.md
@@ -3,9 +3,9 @@
 This backend is based on [http4s](https://http4s.org) (client) and is **asynchronous**. To use, add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "http4s-backend" % "4.0.0-M8" // for cats-effect 3.x & http4s 1.0.0-Mx
+"com.softwaremill.sttp.client4" %% "http4s-backend" % "4.0.0-M9" // for cats-effect 3.x & http4s 1.0.0-Mx
 // or
-"com.softwaremill.sttp.client4" %% "http4s-ce2-backend" % "4.0.0-M8" // for cats-effect 2.x & http4s 0.21.x
+"com.softwaremill.sttp.client4" %% "http4s-ce2-backend" % "4.0.0-M9" // for cats-effect 2.x & http4s 0.21.x
 ```
 
 The backend can be created in a couple of ways, e.g.:
diff --git a/generated-docs/out/backends/javascript/fetch.md b/generated-docs/out/backends/javascript/fetch.md
index d04dd79f70..d207e4ec92 100644
--- a/generated-docs/out/backends/javascript/fetch.md
+++ b/generated-docs/out/backends/javascript/fetch.md
@@ -7,7 +7,7 @@ A JavaScript backend with web socket support. Implemented using the [Fetch API](
 This is the default backend, available in the main jar for JS. To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %%% "core" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %%% "core" % "4.0.0-M9"
 ```
 
 And create the backend instance:
@@ -26,7 +26,7 @@ Note that `Fetch` does not pass cookies by default. If your request needs cookie
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %%% "monix" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %%% "monix" % "4.0.0-M9"
 ```
 
 And create the backend instance:
@@ -40,7 +40,7 @@ val backend = FetchMonixBackend()
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %%% "zio" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %%% "zio" % "4.0.0-M9"
 ```
 
 And create the backend instance:
@@ -55,13 +55,13 @@ Any effect implementing the cats-effect `Concurrent` typeclass can be used. To u
 your project:
 
 ```
-"com.softwaremill.sttp.client4" %%% "cats" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %%% "cats" % "4.0.0-M9"
 ```
 
 If you are on Cats Effect 2 (CE2) you will need to add the CE2 specific dependency instead:
 
 ```
-"com.softwaremill.sttp.client4" %%% "catsce2 % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %%% "catsce2 % "4.0.0-M9"
 ```
 
 And create the backend instance:
@@ -129,7 +129,7 @@ Streaming support is provided via `FetchMonixBackend`. Note that streaming suppo
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %%% "monix" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %%% "monix" % "4.0.0-M9"
 ```
 
 An example of streaming a response:
diff --git a/generated-docs/out/backends/monix.md b/generated-docs/out/backends/monix.md
index ee4e6744dc..30a69767ac 100644
--- a/generated-docs/out/backends/monix.md
+++ b/generated-docs/out/backends/monix.md
@@ -12,7 +12,7 @@ Creation of the backend can be done in two basic ways:
 Firstly, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M9"
 ```
 
 and create the backend using:
@@ -50,7 +50,7 @@ Host header override is supported in environments running Java 12 onwards, but i
 To use, add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "okhttp-backend-monix" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "okhttp-backend-monix" % "4.0.0-M9"
 ```
 
 Create the backend using:
@@ -76,7 +76,7 @@ This backend depends on [OkHttp](http://square.github.io/okhttp/) and fully supp
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "armeria-backend-monix" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "armeria-backend-monix" % "4.0.0-M9"
 ```
 
 add imports:
diff --git a/generated-docs/out/backends/native/curl.md b/generated-docs/out/backends/native/curl.md
index e587cf8a7a..2e658fea91 100644
--- a/generated-docs/out/backends/native/curl.md
+++ b/generated-docs/out/backends/native/curl.md
@@ -5,7 +5,7 @@ A Scala Native backend implemented using [Curl](https://github.com/curl/curl/blo
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %%% "core" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %%% "core" % "4.0.0-M9"
 ```
 
 and initialize one of the backends:
diff --git a/generated-docs/out/backends/pekko.md b/generated-docs/out/backends/pekko.md
index ee98401d1a..ba5d5b795d 100644
--- a/generated-docs/out/backends/pekko.md
+++ b/generated-docs/out/backends/pekko.md
@@ -3,7 +3,7 @@
 This backend is based on [pekko-http](https://pekko.apache.org/docs/pekko-http/current/). To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "pekko-http-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "pekko-http-backend" % "4.0.0-M9"
 ```
 
 A fully **asynchronous** backend. Uses the `Future` effect to return responses. There are also [other `Future`-based backends](future.md), which don't depend on Pekko. 
diff --git a/generated-docs/out/backends/scalaz.md b/generated-docs/out/backends/scalaz.md
index baad93097e..29ad261051 100644
--- a/generated-docs/out/backends/scalaz.md
+++ b/generated-docs/out/backends/scalaz.md
@@ -8,7 +8,7 @@ The [Scalaz](https://github.com/scalaz/scalaz) backend is **asynchronous**. Send
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "armeria-backend-scalaz" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "armeria-backend-scalaz" % "4.0.0-M9"
 ```
 
 add imports:
diff --git a/generated-docs/out/backends/synchronous.md b/generated-docs/out/backends/synchronous.md
index f0df8327f6..6d5f8d745d 100644
--- a/generated-docs/out/backends/synchronous.md
+++ b/generated-docs/out/backends/synchronous.md
@@ -7,7 +7,7 @@ There are several synchronous backend implementations. Sending a request using t
 The default **synchronous** backend. To use, you don't need any extra dependencies, `core` is enough:
 
 ```
-"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9"
 ```
 
 Create the backend using:
@@ -40,7 +40,7 @@ Host header override is supported in environments running Java 12 onwards, but i
 To use, you don't need any extra dependencies, `core` is enough: 
 
 ```
-"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9"
 ```
 
 Create the backend using:
@@ -62,7 +62,7 @@ This backend supports host header override, but it has to be enabled by system p
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "okhttp-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "okhttp-backend" % "4.0.0-M9"
 ```
 
 Create the backend using:
diff --git a/generated-docs/out/backends/wrappers/custom.md b/generated-docs/out/backends/wrappers/custom.md
index eccda7d7ba..e16c53f336 100644
--- a/generated-docs/out/backends/wrappers/custom.md
+++ b/generated-docs/out/backends/wrappers/custom.md
@@ -260,7 +260,7 @@ object RateLimitingSttpBackend {
 Implementing a new backend is made easy as the tests are published in the `core` jar file under the `tests` classifier. Simply add the follow dependencies to your `build.sbt`:
 
 ```
-"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8" % Test classifier "tests"
+"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9" % Test classifier "tests"
 ```
 
 Implement your backend and extend the `HttpTest` class:
@@ -290,9 +290,9 @@ import sttp.client4.impl.cats.implicits._
 from the cats integration module. The module should be available on the classpath after adding following dependency:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "cats" % "4.0.0-M8" // for cats-effect 3.x
+"com.softwaremill.sttp.client4" %% "cats" % "4.0.0-M9" // for cats-effect 3.x
 // or
-"com.softwaremill.sttp.client4" %% "catsce2" % "4.0.0-M8" // for cats-effect 2.x
+"com.softwaremill.sttp.client4" %% "catsce2" % "4.0.0-M9" // for cats-effect 2.x
 ```
 
 The object contains implicits to convert a cats `MonadError` into the sttp `MonadError`, 
diff --git a/generated-docs/out/backends/wrappers/logging.md b/generated-docs/out/backends/wrappers/logging.md
index a9f5a2ae68..ff5ecd6b3e 100644
--- a/generated-docs/out/backends/wrappers/logging.md
+++ b/generated-docs/out/backends/wrappers/logging.md
@@ -28,7 +28,7 @@ Log levels can be configured when creating the `LoggingBackend`, or specified in
 To use the [slf4j](http://www.slf4j.org) logging backend wrapper, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "slf4j-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "slf4j-backend" % "4.0.0-M9"
 ``` 
 
 There are three backend wrappers available, which log request & response information using a slf4j `Logger`. To see the logs, you'll need to use an slf4j-compatible logger implementation, e.g.  [logback](http://logback.qos.ch), or use a binding, e.g. [log4j-slf4j](https://logging.apache.org/log4j/2.0/log4j-slf4j-impl/index.html).
@@ -50,5 +50,5 @@ To create a customised logging backend, see the section on [custom backends](cus
 To use the [scribe](https://github.com/outr/scribe) logging backend wrapper, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "scribe-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "scribe-backend" % "4.0.0-M9"
 ``` 
\ No newline at end of file
diff --git a/generated-docs/out/backends/wrappers/opentelemetry.md b/generated-docs/out/backends/wrappers/opentelemetry.md
index caa819910d..3d95993d94 100644
--- a/generated-docs/out/backends/wrappers/opentelemetry.md
+++ b/generated-docs/out/backends/wrappers/opentelemetry.md
@@ -12,7 +12,7 @@ The backend depends only on [opentelemetry-api](https://github.com/open-telemetr
 following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "opentelemetry-metrics-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "opentelemetry-metrics-backend" % "4.0.0-M9"
 ```
 
 Then an instance can be obtained as follows:
@@ -55,7 +55,7 @@ OpenTelemetryMetricsBackend(
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "opentelemetry-tracing-zio-backend" % "4.0.0-M8"  // for ZIO 2.x
+"com.softwaremill.sttp.client4" %% "opentelemetry-tracing-zio-backend" % "4.0.0-M9"  // for ZIO 2.x
 ```
 
 This backend depends on [zio-opentelemetry](https://github.com/zio/zio-telemetry).
diff --git a/generated-docs/out/backends/wrappers/prometheus.md b/generated-docs/out/backends/wrappers/prometheus.md
index e29ba3254a..419d8cedb2 100644
--- a/generated-docs/out/backends/wrappers/prometheus.md
+++ b/generated-docs/out/backends/wrappers/prometheus.md
@@ -3,7 +3,7 @@
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "prometheus-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "prometheus-backend" % "4.0.0-M9"
 ```
 
 and some imports:
diff --git a/generated-docs/out/backends/zio.md b/generated-docs/out/backends/zio.md
index fccbda50e8..d37538a6b0 100644
--- a/generated-docs/out/backends/zio.md
+++ b/generated-docs/out/backends/zio.md
@@ -9,8 +9,8 @@ The `*-zio` modules depend on ZIO 2.x. For ZIO 1.x support, use modules with the
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M8"  // for ZIO 2.x
-"com.softwaremill.sttp.client4" %% "zio1" % "4.0.0-M8" // for ZIO 1.x
+"com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M9"  // for ZIO 2.x
+"com.softwaremill.sttp.client4" %% "zio1" % "4.0.0-M9" // for ZIO 1.x
 ```
 
 Create the backend using:
@@ -45,8 +45,8 @@ Host header override is supported in environments running Java 12 onwards, but i
 To use, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "armeria-backend-zio" % "4.0.0-M8"  // for ZIO 2.x
-"com.softwaremill.sttp.client4" %% "armeria-backend-zio1" % "4.0.0-M8" // for ZIO 1.x
+"com.softwaremill.sttp.client4" %% "armeria-backend-zio" % "4.0.0-M9"  // for ZIO 2.x
+"com.softwaremill.sttp.client4" %% "armeria-backend-zio1" % "4.0.0-M9" // for ZIO 1.x
 ```
 
 add imports:
diff --git a/generated-docs/out/examples.md b/generated-docs/out/examples.md
index 9f25957d6d..edceb1a584 100644
--- a/generated-docs/out/examples.md
+++ b/generated-docs/out/examples.md
@@ -7,7 +7,7 @@ All of the examples are available [in the sources](https://github.com/softwaremi
 Required dependencies:
 
 ```scala            
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9")
 ```
 
 Example code:
@@ -22,7 +22,7 @@ Example code:
 Required dependencies:
 
 ```scala            
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9")
 ```
 
 Example code:
@@ -38,8 +38,8 @@ Required dependencies:
 
 ```scala
 libraryDependencies ++= List(
-  "com.softwaremill.sttp.client4" %% "akka-http-backend" % "4.0.0-M8",
-  "com.softwaremill.sttp.client4" %% "json4s" % "4.0.0-M8",
+  "com.softwaremill.sttp.client4" %% "akka-http-backend" % "4.0.0-M9",
+  "com.softwaremill.sttp.client4" %% "json4s" % "4.0.0-M9",
   "org.json4s" %% "json4s-native" % "3.6.0"
 )
 ```
@@ -57,8 +57,8 @@ Required dependencies:
 
 ```scala
 libraryDependencies ++= List(
-  "com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M8",
-  "com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M8",
+  "com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M9",
+  "com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M9",
   "io.circe" %% "circe-generic" % "0.14.6"
 )
 ```
@@ -76,8 +76,8 @@ Required dependencies:
 
 ```scala
 libraryDependencies ++= List(
-  "com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M8",
-  "com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M8",
+  "com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M9",
+  "com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M9",
   "io.circe" %% "circe-generic" % "0.14.6"
 )
 ```
@@ -95,8 +95,8 @@ Required dependencies:
 
 ```scala
 libraryDependencies ++= List(
-  "com.softwaremill.sttp.client4" %% "slf4j-backend" % "4.0.0-M8",
-  "com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M8",
+  "com.softwaremill.sttp.client4" %% "slf4j-backend" % "4.0.0-M9",
+  "com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M9",
   "io.circe" %% "circe-generic" % "0.14.6"
 )
 ```
@@ -114,8 +114,8 @@ Required dependencies:
 
 ```scala
 libraryDependencies ++= List(
-  "com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M8",
-  "com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M8",
+  "com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M9",
+  "com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M9",
   "io.circe" %% "circe-generic" % "0.14.6"
 )
 ```
@@ -132,7 +132,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9")
 ```
 
 Example code:
@@ -146,7 +146,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M9")
 ```
 
 Example code:
@@ -161,7 +161,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "fs2" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "fs2" % "4.0.0-M9")
 ```
 
 Example code:
@@ -176,7 +176,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M9")
 ```
 
 Example code:
@@ -191,7 +191,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "akka-http-backend" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "akka-http-backend" % "4.0.0-M9")
 ```
 
 Example code:
@@ -206,7 +206,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "pekko-http-backend" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "pekko-http-backend" % "4.0.0-M9")
 ```
 
 Example code:
@@ -221,7 +221,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "monix" % "4.0.0-M9")
 ```
 
 Example code:
@@ -236,7 +236,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "fs2" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "fs2" % "4.0.0-M9")
 ```
 
 Example code:
@@ -251,7 +251,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M9")
 ```
 
 Example code:
@@ -266,7 +266,7 @@ Example code:
 Required dependencies:
 
 ```scala
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "zio" % "4.0.0-M9")
 ```
 
 Example code:
@@ -281,7 +281,7 @@ Example code:
 Required dependencies:
 
 ```scala            
-libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8")
+libraryDependencies ++= List("com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9")
 ```
 
 Example code:
diff --git a/generated-docs/out/json.md b/generated-docs/out/json.md
index 0fe0321a6c..9eedb4a3c3 100644
--- a/generated-docs/out/json.md
+++ b/generated-docs/out/json.md
@@ -34,7 +34,7 @@ case class ResponsePayload(data: String)
 JSON encoding of bodies and decoding of responses can be handled using [Circe](https://circe.github.io/circe/) by the `circe` module. To use add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "circe" % "4.0.0-M9"
 ```
 
 This module adds a body serialized, so that json payloads can be sent as request bodies. To send a payload of type `T` as json, a `io.circe.Encoder[T]` implicit value must be available in scope.
@@ -66,7 +66,7 @@ Arbitrary JSON structures can be traversed by parsing the result as `io.circe.Js
 To encode and decode json using json4s, add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "json4s" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "json4s" % "4.0.0-M9"
 "org.json4s" %% "json4s-native" % "3.6.0"
 ```
 
@@ -100,7 +100,7 @@ val response: Response[Either[ResponseException[String, Exception], ResponsePayl
 To encode and decode JSON using [spray-json](https://github.com/spray/spray-json), add the following dependency to your project:
 
 ```
-"com.softwaremill.sttp.client4" %% "spray-json" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "spray-json" % "4.0.0-M9"
 ```
 
 Using this module it is possible to set request bodies and read response bodies as your custom types, using the implicitly available instances of `spray.json.JsonWriter` / `spray.json.JsonReader` or `spray.json.JsonFormat`.
@@ -132,13 +132,13 @@ val response: Response[Either[ResponseException[String, Exception], ResponsePayl
 To encode and decode JSON using [play-json](https://www.playframework.com), add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "play-json" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "play-json" % "4.0.0-M9"
 ```
 
 If you use older version of play (2.9.x), add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "play29-json" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "play29-json" % "4.0.0-M9"
 ```
 
 To use, add an import: `import sttp.client4.playJson._`.
@@ -150,13 +150,13 @@ To encode and decode JSON using the high-performance [zio-json](https://zio.gith
 The `zio-json` module depends on ZIO 2.x. For ZIO 1.x support, use `zio1-json`.
 
 ```scala
-"com.softwaremill.sttp.client4" %% "zio-json" % "4.0.0-M8"  // for ZIO 2.x
-"com.softwaremill.sttp.client4" %% "zio1-json" % "4.0.0-M8" // for ZIO 1.x
+"com.softwaremill.sttp.client4" %% "zio-json" % "4.0.0-M9"  // for ZIO 2.x
+"com.softwaremill.sttp.client4" %% "zio1-json" % "4.0.0-M9" // for ZIO 1.x
 ```
 or for ScalaJS (cross build) projects:
 ```scala
-"com.softwaremill.sttp.client4" %%% "zio-json" % "4.0.0-M8"  // for ZIO 2.x
-"com.softwaremill.sttp.client4" %%% "zio1-json" % "4.0.0-M8" // for ZIO 1.x
+"com.softwaremill.sttp.client4" %%% "zio-json" % "4.0.0-M9"  // for ZIO 2.x
+"com.softwaremill.sttp.client4" %%% "zio1-json" % "4.0.0-M9" // for ZIO 1.x
 ```
 
 To use, add an import: `import sttp.client4.ziojson._` (or extend `SttpZioJsonApi`), define an implicit `JsonCodec`, or `JsonDecoder`/`JsonEncoder` for your datatype.
@@ -188,13 +188,13 @@ basicRequest
 To encode and decode JSON using the [high(est)-performant](https://plokhotnyuk.github.io/jsoniter-scala/) [jsoniter-scala](https://github.com/plokhotnyuk/jsoniter-scala) library, one add the following dependency to your project.
 
 ```scala
-"com.softwaremill.sttp.client4" %% "jsoniter" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "jsoniter" % "4.0.0-M9"
 ```
 
 or for ScalaJS (cross build) projects:
 
 ```scala
-"com.softwaremill.sttp.client4" %%% "jsoniter" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %%% "jsoniter" % "4.0.0-M9"
 ```
 
 To use, add an import: `import sttp.client4.jsoniter._` (or extend `SttpJsonIterJsonApi`), define an implicit `JsonCodec`, or `JsonDecoder`/`JsonEncoder` for your datatype.
@@ -228,13 +228,13 @@ basicRequest
 To encode and decode JSON using the [uPickle](https://github.com/com-lihaoyi/upickle) library, add the following dependency to your project:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "upickle" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "upickle" % "4.0.0-M9"
 ```
 
 or for ScalaJS (cross build) projects:
 
 ```scala
-"com.softwaremill.sttp.client4" %%% "upickle" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %%% "upickle" % "4.0.0-M9"
 ```
 
 To use, add an import: `import sttp.client4.upicklejson.default._` and define an implicit `ReadWriter` (or separately `Reader` and `Writer`) for your datatype.
diff --git a/generated-docs/out/model/uri.md b/generated-docs/out/model/uri.md
index ef146a4bbb..62b75f91f4 100644
--- a/generated-docs/out/model/uri.md
+++ b/generated-docs/out/model/uri.md
@@ -36,7 +36,7 @@ import sttp.client4._
 println(uri"http://example.org/${"a/b"}")
 // http://example.org/a%2Fb
 
-// the embedded / is not escaped
+// the literal / is not escaped
 println(uri"http://example.org/${"a"}/${"b"}")
 // http://example.org/a/b
 
@@ -142,7 +142,7 @@ which is an ordinary `case class`, will contain a path segment with `a b`.
 
 When parsing, that includes creating URIs from constant strings e.g. `uri"http://example.com/a%20b"`, all of the 
 components are decoded and stored in this form. This means that `Uri` might **not** exactly preserve the original
-form, in which path segments or query parameters have been writte down (this might change in a future major release,
+form, in which path segments or query parameters have been written down (this might change in a future major release,
 though).
 
 When serialising the `Uri` back to a `String`, the code follows the escaping rules defined in 
@@ -168,4 +168,4 @@ println(uri"http://example.com?a=b/?c%26d".querySegmentsEncoding(Uri.QuerySegmen
 // compare to:
 println(uri"http://example.com?a=b/?c%26d")
 // http://example.com?a=b/?c%26d
-```
\ No newline at end of file
+```
diff --git a/generated-docs/out/openapi.md b/generated-docs/out/openapi.md
index 71b4173330..5f0923ed57 100644
--- a/generated-docs/out/openapi.md
+++ b/generated-docs/out/openapi.md
@@ -45,8 +45,8 @@ lazy val petstoreApi: Project = project
     openApiGeneratorName := "scala-sttp",
     openApiOutputDir := baseDirectory.value.name,
     libraryDependencies ++= Seq(
-      "com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8",
-      "com.softwaremill.sttp.client4" %% "json4s" % "4.0.0-M8",
+      "com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9",
+      "com.softwaremill.sttp.client4" %% "json4s" % "4.0.0-M9",
       "org.json4s" %% "json4s-jackson" % "3.6.8"
     )
   )
@@ -96,8 +96,8 @@ lazy val petstoreApi: Project = project
     openApiOutputDir := baseDirectory.value.name,
     openApiIgnoreFileOverride := s"${baseDirectory.in(ThisBuild).value.getPath}/openapi-ignore-file",
     libraryDependencies ++= Seq(
-      "com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8",
-      "com.softwaremill.sttp.client4" %% "json4s" % "4.0.0-M8",
+      "com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9",
+      "com.softwaremill.sttp.client4" %% "json4s" % "4.0.0-M9",
       "org.json4s" %% "json4s-jackson" % "3.6.8"
     ),
     (compile in Compile) := ((compile in Compile) dependsOn openApiGenerate).value,
diff --git a/generated-docs/out/quickstart.md b/generated-docs/out/quickstart.md
index f56fb48aa3..dd0f0bed6d 100644
--- a/generated-docs/out/quickstart.md
+++ b/generated-docs/out/quickstart.md
@@ -15,7 +15,7 @@ platforms, and that each has its own dedicated set of backends.
 The basic dependency which provides the API, together with a synchronous and `Future`-based backends, is:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "core" % "4.0.0-M9"
 ```
 
 ## Using scala-cli
@@ -23,7 +23,7 @@ The basic dependency which provides the API, together with a synchronous and `Fu
 Add the following directive to the top of your scala file to add the core sttp dependency:
 
 ```
-//> using lib "com.softwaremill.sttp.client4::core:4.0.0-M8"
+//> using lib "com.softwaremill.sttp.client4::core:4.0.0-M9"
 ```
 
 ## Using Ammonite
@@ -31,7 +31,7 @@ Add the following directive to the top of your scala file to add the core sttp d
 If you are an [Ammonite](https://ammonite.io) user, you can quickly start experimenting with sttp by copy-pasting the following:
 
 ```scala
-import $ivy.`com.softwaremill.sttp.client4::core:4.0.0-M8`
+import $ivy.`com.softwaremill.sttp.client4::core:4.0.0-M9`
 ```
 
 ## Imports
@@ -72,7 +72,7 @@ As an example, to integrate with the [uPickle](https://github.com/com-lihaoyi/up
 dependency:
 
 ```scala
-"com.softwaremill.sttp.client4" %% "upickle" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "upickle" % "4.0.0-M9"
 ```
 
 Your code might then look as follows:
@@ -109,7 +109,7 @@ Logging can be added using the [logging backend wrapper](backends/wrappers/loggi
 use slf4j, you'll need the following dependency:
 
 ```
-"com.softwaremill.sttp.client4" %% "slf4j-backend" % "4.0.0-M8"
+"com.softwaremill.sttp.client4" %% "slf4j-backend" % "4.0.0-M9"
 ```
 
 Then, you'll need to configure your client:
diff --git a/project/build.properties b/project/build.properties
index d415199524..04267b14af 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.9.7
\ No newline at end of file
+sbt.version=1.9.9
diff --git a/project/plugins.sbt b/project/plugins.sbt
index b80b6c2fab..e5265f4377 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,15 +1,15 @@
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.14.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.15.0")
 addSbtPlugin("org.scala-js" % "sbt-jsdependencies" % "1.0.2")
-addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.16")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.17")
 addSbtPlugin("io.spray" % "sbt-revolver" % "0.10.0")
-addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.9.1")
+addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.9.2")
 
-val sbtSoftwareMillVersion = "2.0.18"
+val sbtSoftwareMillVersion = "2.0.19"
 addSbtPlugin("com.softwaremill.sbt-softwaremill" % "sbt-softwaremill-common" % sbtSoftwareMillVersion)
 addSbtPlugin("com.softwaremill.sbt-softwaremill" % "sbt-softwaremill-publish" % sbtSoftwareMillVersion)
 addSbtPlugin("com.softwaremill.sbt-softwaremill" % "sbt-softwaremill-browser-test-js" % sbtSoftwareMillVersion)
 
-addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.5.1")
+addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.5.2")
 
 addSbtPlugin("org.jetbrains.scala" % "sbt-ide-settings" % "1.1.2")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.3")