diff --git a/build.sbt b/build.sbt
index 01d4680..ad942e4 100644
--- a/build.sbt
+++ b/build.sbt
@@ -11,12 +11,12 @@ val thriftVersion = "0.20.0"    // remember to also update package.json if the t
 
 val artifactProductionSettings = Seq(
   organization := "com.gu",
-  scalaVersion := "2.13.12",
+  scalaVersion := "2.13.18",
   // downgrade scrooge reserved word clashes to warnings
   Compile / scroogeDisableStrict := true,
   // Scrooge 21.3.0 dropped support for scala < 2.12, so we can only build 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),
   licenses := Seq(License.Apache2)
   /*
   Test / testOptions +=
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
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 0e05311..3fb48ef 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -3,7 +3,7 @@ addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.7.0")
 addSbtPlugin("com.github.sbt" % "sbt-release" % "1.4.0")
 addSbtPlugin("com.twitter" % "scrooge-sbt-plugin" % "22.1.0")
 addSbtPlugin("com.gu" % "sbt-scrooge-typescript" % "4.0.1")
-addSbtPlugin("ch.epfl.scala" % "sbt-version-policy" % "3.2.0")
+addSbtPlugin("ch.epfl.scala" % "sbt-version-policy" % "3.2.1")