diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 44b0cc3..03583c9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.12.18, 2.13.12]
+        scala: [2.12.21, 2.13.12]
         java: [temurin@11]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/build.sbt b/build.sbt
index 0e2260d..abfb80b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,4 +1,4 @@
-ThisBuild / crossScalaVersions := Seq("2.12.18", "2.13.12")
+ThisBuild / crossScalaVersions := Seq("2.12.21", "2.13.12")
 ThisBuild / scalaVersion := crossScalaVersions.value.last
 
 ThisBuild / githubWorkflowArtifactUpload := false