diff --git a/.github/workflows/backend-ci.yml b/.github/workflows/backend-ci.yml
index c7aa184..53bce85 100644
--- a/.github/workflows/backend-ci.yml
+++ b/.github/workflows/backend-ci.yml
@@ -28,7 +28,7 @@ jobs:
           fetch-depth: 0  # full history for branch diff logic
 
       - name: Set up JDK 21
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           distribution: temurin
           java-version: '21'
@@ -78,7 +78,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Set up JDK 21
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           distribution: temurin
           java-version: '21'
diff --git a/.github/workflows/backend-coverage.yml b/.github/workflows/backend-coverage.yml
index c32162e..2da17cc 100644
--- a/.github/workflows/backend-coverage.yml
+++ b/.github/workflows/backend-coverage.yml
@@ -21,7 +21,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up JDK 21
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           distribution: temurin
           java-version: '21'