diff --git a/.github/workflows/java-ci.yml b/.github/workflows/java-ci.yml
index 528cef1..7a5fbf4 100644
--- a/.github/workflows/java-ci.yml
+++ b/.github/workflows/java-ci.yml
@@ -40,7 +40,7 @@ jobs:
     - name: Set up JDK
       uses: actions/setup-java@v6
       with:
-        java-version: 17
+        java-version: 21
         distribution: zulu
         cache: gradle
         
diff --git a/.github/workflows/scheduled-test.yml b/.github/workflows/scheduled-test.yml
index f9fa0f1..7686663 100644
--- a/.github/workflows/scheduled-test.yml
+++ b/.github/workflows/scheduled-test.yml
@@ -39,7 +39,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v6
         with:
-          java-version: 17
+          java-version: 21
           distribution: zulu
           cache: gradle
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b01c7be..364b068 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -42,7 +42,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v6
         with:
-          java-version: 17
+          java-version: 21
           distribution: zulu
           cache: gradle