diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bad3385..b7c8bba 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,12 +14,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup JDK
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           distribution: corretto
-          java-version: 17 # Currently Java 17 required by `s3mock-testcontainers`
+          java-version-file: .tool-versions
           cache: sbt
       - name: Build and Test
         run: sbt -v +test
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..7eb0080
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+java corretto-21.0.2.13.1