diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index eb42b3d0..5bd6eeb4 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -11,10 +11,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v3.10.0
       with:
-        java-version: 17
+        java-version: 21
         distribution: 'zulu'
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
diff --git a/src/main/resources/meteor-rejects-meteor.mixins.json b/src/main/resources/meteor-rejects-meteor.mixins.json
index 4cb4a2fe..caa371f7 100644
--- a/src/main/resources/meteor-rejects-meteor.mixins.json
+++ b/src/main/resources/meteor-rejects-meteor.mixins.json
@@ -1,7 +1,7 @@
 {
   "required": true,
   "package": "anticope.rejects.mixin.meteor",
-  "compatibilityLevel": "JAVA_16",
+  "compatibilityLevel": "JAVA_21",
   "client": [
     "AccountMixin",
     "AccountsMixin",