diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index 02e52d6..e80b88e 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -20,14 +20,18 @@ jobs:
       - name: Run chmod to make gradlew executable
         run: chmod +x ./gradlew
 
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+
       # 테스트와 빌드를 실행
       - name: Build with Gradle
         uses: gradle/gradle-build-action@v3
         with:
           arguments: clean build
           cache-disabled: true
-          java-version: '17'
-          distribution: 'temurin'
         env:
           GOOGLE_CLIENT_ID: ${{ secrets.GOOGLE_CLIENT_ID }}
           GOOGLE_CLIENT_SECRET: ${{ secrets.GOOGLE_CLIENT_SECRET }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 61eac01..5ae8380 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,13 +20,17 @@ jobs:
       - name: Run chmod to make gradlew executable
         run: chmod +x ./gradlew
 
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+
       - name: Build with Gradle (and run tests)
         uses: gradle/gradle-build-action@v3
         with:
           arguments: clean build
           cache-disabled: true # 캐시 오류 방지
-          java-version: '17'
-          distribution: 'temurin'
         env:
           GOOGLE_CLIENT_ID: ${{ secrets.GOOGLE_CLIENT_ID }}
           GOOGLE_CLIENT_SECRET: ${{ secrets.GOOGLE_CLIENT_SECRET }}
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index c7b6584..3d19c24 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM eclipse-temurin:17.0.17_10-jre-noble
+FROM eclipse-temurin:21.0.9_10-jre-ubi9-minimal
 
 ARG JAR_FILE=build/libs/*.jar
 
diff --git a/build.gradle b/build.gradle
index 7033a7f..107fe23 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,8 +9,8 @@ version = '0.0.1-SNAPSHOT'
 description = 'openMission'
 
 java {
-	sourceCompatibility = JavaVersion.VERSION_17
-	targetCompatibility = JavaVersion.VERSION_17
+	sourceCompatibility = JavaVersion.VERSION_21
+	targetCompatibility = JavaVersion.VERSION_21
 }
 
 configurations {