diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index 4af0adb..1bed976 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -12,11 +12,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up JDK 19
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: "19"
+          java-version: "21"
           cache: gradle
 
       - name: Build (skip tests)
diff --git a/build.gradle.kts b/build.gradle.kts
index e26ed4a..6440aa1 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -12,7 +12,7 @@ description = "TrisolarisServer"
 
 java {
 	toolchain {
-		languageVersion = JavaLanguageVersion.of(19)
+		languageVersion = JavaLanguageVersion.of(21)
 	}
 }