diff --git a/build.sbt b/build.sbt
index 3eaf3bb..6b9bb8a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,7 +2,7 @@ lazy val precompiler = (project in file("precompiler")).settings(baseSettings).s
   sbtPlugin := false,
   name := "scalate-precompiler",
   libraryDependencies += "org.scalatra.scalate" %% "scalate-core" % "1.10.1" % "compile",
-  crossScalaVersions := Seq("3.3.7", "2.13.18", "2.12.20")
+  crossScalaVersions := Seq("3.3.7", "2.13.18", "2.12.21")
 ).disablePlugins(ScriptedPlugin)
 
 lazy val plugin = (project in file("plugin")).settings(baseSettings).settings(
diff --git a/plugin/src/sbt-test/plugin/always_recompile/build.sbt b/plugin/src/sbt-test/plugin/always_recompile/build.sbt
index d6aed16..f1323f8 100644
--- a/plugin/src/sbt-test/plugin/always_recompile/build.sbt
+++ b/plugin/src/sbt-test/plugin/always_recompile/build.sbt
@@ -1,7 +1,7 @@
 import org.fusesource.scalate.ScalatePlugin._
 import ScalateKeys._
 
-scalaVersion := "2.12.20"
+scalaVersion := "2.12.21"
 
 libraryDependencies += "org.scalatra.scalate" %% "scalate-core" % "1.10.1" % "compile"
 
diff --git a/plugin/src/sbt-test/plugin/overwrite/build.sbt b/plugin/src/sbt-test/plugin/overwrite/build.sbt
index a2084fd..5b57c45 100644
--- a/plugin/src/sbt-test/plugin/overwrite/build.sbt
+++ b/plugin/src/sbt-test/plugin/overwrite/build.sbt
@@ -1,7 +1,7 @@
 import org.fusesource.scalate.ScalatePlugin._
 import ScalateKeys._
 
-scalaVersion := "2.12.20"
+scalaVersion := "2.12.21"
 
 libraryDependencies += "org.scalatra.scalate" %% "scalate-core" % "1.10.1" % "compile"
 
diff --git a/plugin/src/sbt-test/plugin/simple/build.sbt b/plugin/src/sbt-test/plugin/simple/build.sbt
index 77a08d1..983db84 100644
--- a/plugin/src/sbt-test/plugin/simple/build.sbt
+++ b/plugin/src/sbt-test/plugin/simple/build.sbt
@@ -1,7 +1,7 @@
 import org.fusesource.scalate.ScalatePlugin._
 import ScalateKeys._
 
-scalaVersion := "2.12.20"
+scalaVersion := "2.12.21"
 
 libraryDependencies += "org.scalatra.scalate" %% "scalate-core" % "1.10.1" % "compile"