diff --git a/.gitea/workflows/build-readme.yml b/.gitea/workflows/build-readme.yml
index eb47f8e..501e50d 100644
--- a/.gitea/workflows/build-readme.yml
+++ b/.gitea/workflows/build-readme.yml
@@ -22,7 +22,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: "21"
+          java-version: "25"
 
       - name: Set up Gradle
         run: |
diff --git a/build/client-renderer/build.gradle b/build/client-renderer/build.gradle
index acc5efa..cd8a992 100644
--- a/build/client-renderer/build.gradle
+++ b/build/client-renderer/build.gradle
@@ -24,13 +24,13 @@ dependencies {
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(21)
+        languageVersion = JavaLanguageVersion.of(25)
     }
 }
 
 tasks.withType(JavaCompile).configureEach {
     options.encoding = 'UTF-8'
-    options.release = 21
+    options.release = 25
 }
 
 sourceSets {