diff --git a/.gitea/workflows/qs.yml b/.gitea/workflows/qs.yml
index 703c544..43fcf81 100644
--- a/.gitea/workflows/qs.yml
+++ b/.gitea/workflows/qs.yml
@@ -8,7 +8,7 @@ jobs:
     name: "Gradle Check"
     runs-on: "ubuntu-latest"
     container:
-      image: "cimg/openjdk:22.0-node"
+      image: "cimg/openjdk:21.0-node"
     steps:
       - name: "Checkout"
         uses: actions/checkout@v3
diff --git a/build.gradle.kts b/build.gradle.kts
index 74fefa1..e9345bc 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -9,7 +9,7 @@ version = "0.0.1-SNAPSHOT"
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(22)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 }