diff --git a/build.sbt b/build.sbt
index b7e770f..fa5da8c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -13,7 +13,7 @@ val circeVersion = "0.14.1"
 val fezziwigVersion = "2.0.0"
 
 // dependency versions (for tests only)
-val scalaTestVersion = "3.0.8"
+val scalaTestVersion = "3.0.9"
 val guavaVersion = "19.0"
 val diffsonVersion = "4.1.1"
 
@@ -25,12 +25,12 @@ val snapshotReleaseSuffix = "-SNAPSHOT"
 
 
 lazy val artifactProductionSettings = Seq(
-  scalaVersion := "2.13.12",
+  scalaVersion := "2.13.18",
   // This old attempt to downgrade scrooge reserved word clashes is now insufficient... https://github.com/twitter/scrooge/issues/259#issuecomment-1900743695
   Compile / scroogeDisableStrict := true,
   // scrooge 21.3.0: Builds are now only supported for Scala 2.12+
   // https://twitter.github.io/scrooge/changelog.html#id11
-  crossScalaVersions := Seq("2.12.18", scalaVersion.value),
+  crossScalaVersions := Seq("2.12.21", scalaVersion.value),
   organization := "com.gu",
   licenses := Seq("Apache v2" -> url("http://www.apache.org/licenses/LICENSE-2.0.html")),
   scmInfo := Some(ScmInfo(url("https://github.com/guardian/content-api-models"), "scm:git@github.com:guardian/content-api-models.git")),
diff --git a/project/build.properties b/project/build.properties
index abbbce5..04267b1 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.9.8
+sbt.version=1.9.9