diff --git a/bom/application/pom.xml b/bom/application/pom.xml
index 96ea50d149275..03bd67b10712a 100644
--- a/bom/application/pom.xml
+++ b/bom/application/pom.xml
@@ -159,7 +159,7 @@
         <aws-xray.version>2.14.0</aws-xray.version>
         <azure-functions-java-library.version>2.2.0</azure-functions-java-library.version>
         <azure-functions-java-spi.version>1.0.0</azure-functions-java-spi.version>
-        <kotlin.version>1.8.22</kotlin.version>
+        <kotlin.version>1.9.0</kotlin.version>
         <kotlin.coroutine.version>1.7.2</kotlin.coroutine.version>
         <azure.toolkit-lib.version>0.27.0</azure.toolkit-lib.version>
         <kotlin-serialization.version>1.5.1</kotlin-serialization.version>
diff --git a/build-parent/pom.xml b/build-parent/pom.xml
index 783effee2f577..33867598a7be9 100644
--- a/build-parent/pom.xml
+++ b/build-parent/pom.xml
@@ -21,7 +21,7 @@
         <!-- These properties are needed in order for them to be resolvable by the generated projects -->
         <!-- Quarkus uses jboss-parent and it comes with 3.8.1-jboss-1, we don't want that in the templates -->
         <compiler-plugin.version>3.11.0</compiler-plugin.version>
-        <kotlin.version>1.8.22</kotlin.version>
+        <kotlin.version>1.9.0</kotlin.version>
         <dokka.version>1.8.20</dokka.version>
         <scala.version>2.13.8</scala.version>
         <scala-maven-plugin.version>4.8.1</scala-maven-plugin.version>
diff --git a/devtools/gradle/gradle-application-plugin/src/test/java/io/quarkus/gradle/QuarkusPluginTest.java b/devtools/gradle/gradle-application-plugin/src/test/java/io/quarkus/gradle/QuarkusPluginTest.java
index f5f6a34471cb1..aaeb75459ec1e 100644
--- a/devtools/gradle/gradle-application-plugin/src/test/java/io/quarkus/gradle/QuarkusPluginTest.java
+++ b/devtools/gradle/gradle-application-plugin/src/test/java/io/quarkus/gradle/QuarkusPluginTest.java
@@ -105,7 +105,7 @@ public void shouldReturnMultipleOutputSourceDirectories() {
 
     @Test
     public void shouldNotFailOnProjectDependenciesWithoutMain(@TempDir Path testProjectDir) throws IOException {
-        var kotlinVersion = System.getProperty("kotlin_version", "1.8.22");
+        var kotlinVersion = System.getProperty("kotlin_version", "1.9.0");
         var settingFile = testProjectDir.resolve("settings.gradle.kts");
         var mppProjectDir = testProjectDir.resolve("mpp");
         var quarkusProjectDir = testProjectDir.resolve("quarkus");
diff --git a/independent-projects/arc/pom.xml b/independent-projects/arc/pom.xml
index 8026f4eefbad0..c8e7c2eac739f 100644
--- a/independent-projects/arc/pom.xml
+++ b/independent-projects/arc/pom.xml
@@ -54,7 +54,7 @@
         <!-- test versions -->
         <version.assertj>3.24.2</version.assertj>
         <version.junit5>5.9.3</version.junit5>
-        <version.kotlin>1.8.22</version.kotlin>
+        <version.kotlin>1.9.0</version.kotlin>
         <version.kotlin-coroutines>1.7.1</version.kotlin-coroutines>
         <version.mockito>5.4.0</version.mockito>
         <!-- TCK versions -->
diff --git a/integration-tests/gradle/src/main/resources/conditional-dependencies-kotlin/build.gradle.kts b/integration-tests/gradle/src/main/resources/conditional-dependencies-kotlin/build.gradle.kts
index 6f7310100913a..a4b08923c3a60 100644
--- a/integration-tests/gradle/src/main/resources/conditional-dependencies-kotlin/build.gradle.kts
+++ b/integration-tests/gradle/src/main/resources/conditional-dependencies-kotlin/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
-    kotlin("jvm") version "1.8.22"
-    kotlin("plugin.allopen") version "1.8.22"
+    kotlin("jvm") version "1.9.0"
+    kotlin("plugin.allopen") version "1.9.0"
     id("io.quarkus")
 }