diff --git a/.github/actions/setup-env/action.yaml b/.github/actions/setup-env/action.yaml
index b373b759f..182f3da40 100644
--- a/.github/actions/setup-env/action.yaml
+++ b/.github/actions/setup-env/action.yaml
@@ -15,7 +15,7 @@ inputs:
   java-version:
     description: Java version.
     required: false
-    default: "17"
+    default: "21"
 
 runs:
   using: "composite"
diff --git a/api/build.gradle b/api/build.gradle
index 7095daa57..adddf4269 100644
--- a/api/build.gradle
+++ b/api/build.gradle
@@ -9,9 +9,15 @@ plugins {
 group = 'run.halo.app'
 description = 'API of halo project, connecting by other projects.'
 
+tasks.withType(JavaCompile).configureEach {
+    options.release = 21
+    options.encoding = 'UTF-8'
+}
+
 java {
-    sourceCompatibility = JavaVersion.VERSION_17
-    targetCompatibility = JavaVersion.VERSION_17
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
 }
 
 compileJava.options.encoding = "UTF-8"
diff --git a/application/build.gradle b/application/build.gradle
index 73f328e9d..d58523af8 100644
--- a/application/build.gradle
+++ b/application/build.gradle
@@ -17,12 +17,16 @@ plugins {
 }
 
 group = 'run.halo.app'
-compileJava.options.encoding = 'UTF-8'
-compileTestJava.options.encoding = 'UTF-8'
+
+tasks.withType(JavaCompile).configureEach {
+    options.release = 21
+    options.encoding = 'UTF-8'
+}
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_17
-    targetCompatibility = JavaVersion.VERSION_17
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
 }
 
 idea {