diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 058bf61..c77a11c 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -42,6 +42,6 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - uses: cedx/setup-ant@main
       - run: ant -version
diff --git a/docs/usage/basic-setup.md b/docs/usage/basic-setup.md
index e996bfb..704bdf2 100644
--- a/docs/usage/basic-setup.md
+++ b/docs/usage/basic-setup.md
@@ -10,7 +10,7 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - uses: cedx/setup-ant@v1
         with:
           optional-tasks: true
diff --git a/docs/usage/matrix-setup.md b/docs/usage/matrix-setup.md
index 7290c64..45afa8d 100644
--- a/docs/usage/matrix-setup.md
+++ b/docs/usage/matrix-setup.md
@@ -15,7 +15,7 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - uses: cedx/setup-ant@v1
         with:
           optional-tasks: true
diff --git a/example/workflow.yaml b/example/workflow.yaml
index 771bcea..2713847 100644
--- a/example/workflow.yaml
+++ b/example/workflow.yaml
@@ -13,7 +13,7 @@ jobs:
         uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: Set up Ant
         uses: cedx/setup-ant@v1
         with: