diff --git a/.github/workflows/auto-jdk-os-matrix.yml b/.github/workflows/auto-jdk-os-matrix.yml
index 134e34a2..ba8db79a 100644
--- a/.github/workflows/auto-jdk-os-matrix.yml
+++ b/.github/workflows/auto-jdk-os-matrix.yml
@@ -25,7 +25,7 @@ jobs:
         uses: actions/checkout@v7
 
       - name: Install Build JDKs for Subproject Toolchains
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v5.6.0
         with:
           java-version: |
             11
diff --git a/.github/workflows/javadoc.yml b/.github/workflows/javadoc.yml
index 5e019b4e..f77c57a9 100644
--- a/.github/workflows/javadoc.yml
+++ b/.github/workflows/javadoc.yml
@@ -31,7 +31,7 @@ jobs:
           fetch-depth: 0
 
       - name: 2a. Provision JDK 11 Toolchain
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v5.6.0
         with:
          java-version: '11'
          distribution: 'temurin'
@@ -39,7 +39,7 @@ jobs:
          architecture: x64
 
       - name: 2b. Provision JDK 17 Toolchain
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v5.6.0
         with:
           java-version: '17'
           distribution: 'temurin'
@@ -47,7 +47,7 @@ jobs:
           architecture: x64
 
       - name: 2c. Provision JDK 25 (Host Runtime)
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v5.6.0
         with:
           java-version: '25'
           distribution: 'temurin'
diff --git a/.github/workflows/stageReleaseSources.yml b/.github/workflows/stageReleaseSources.yml
index e627cf0f..c9a7d645 100644
--- a/.github/workflows/stageReleaseSources.yml
+++ b/.github/workflows/stageReleaseSources.yml
@@ -28,7 +28,7 @@ jobs:
 
       # 2. Set up the foundational Java runtime environment
       - name: 2. Provision JDK 25 for Build Execution
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v5.6.0
         with:
           java-version: '25'
           distribution: 'temurin'
@@ -128,7 +128,7 @@ jobs:
 
       # 3. Setup Java Toolchain (11, 17, 21, 25)
       - name: Setup Java Toolchains
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v5.6.0
         with:
           java-version: |
             11