diff --git a/api/build.sbt b/api/build.sbt
index d82ae60..23d0bf6 100644
--- a/api/build.sbt
+++ b/api/build.sbt
@@ -10,15 +10,15 @@ enablePlugins(
 organization := "com.gu"
 name := "avatar-api"
 version := "1.0"
-scalaVersion := "2.12.8"
+scalaVersion := "2.12.19"
 
-val ScalatraVersion = "2.6.3"
+val ScalatraVersion = "2.8.4"
 val jettyVersion = "9.4.53.v20231009"
 val json4sVersion = "3.5.2"
 val logbackVersion = "1.2.13"
 val logstashEncoderVersion = "7.3"
 val servletApiVersion = "3.1.0"
-val scalazVersion = "7.1.17"
+val scalazVersion = "7.3.8"
 val identityVersion = "4.31"
 val typesafeConfigVersion = "1.2.1"
 val amazonawsVersion = "1.12.668"
diff --git a/api/project/build.properties b/api/project/build.properties
index 72413de..ee4c672 100644
--- a/api/project/build.properties
+++ b/api/project/build.properties
@@ -1 +1 @@
-sbt.version=1.8.3
+sbt.version=1.10.1