diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2d52c2d..76fd701 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,7 +19,7 @@ jobs:
         run: mkdir -p ~/.gradle ; cp .github/ci-gradle.properties ~/.gradle/gradle.properties
 
       - name: Set up JDK 25
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v5.6.0
         with:
           distribution: 'zulu'
           java-version: 25
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 6138d84..f7c691f 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -13,7 +13,7 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v7
       - name: Set up JDK 25
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v5.6.0
         with:
           distribution: 'zulu'
           java-version: 25
diff --git a/.github/workflows/smoke-reference.yml b/.github/workflows/smoke-reference.yml
index 1a2412a..4d56be2 100644
--- a/.github/workflows/smoke-reference.yml
+++ b/.github/workflows/smoke-reference.yml
@@ -56,7 +56,7 @@ jobs:
         run: mkdir -p ~/.gradle ; cp .github/ci-gradle.properties ~/.gradle/gradle.properties
 
       - name: Set up JDK 25
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v5.6.0
         with:
           distribution: 'zulu'
           java-version: 25