diff --git a/.github/actions/gradle/experiment-1/action.yml b/.github/actions/gradle/experiment-1/action.yml
index ad104ba6..a09e5161 100644
--- a/.github/actions/gradle/experiment-1/action.yml
+++ b/.github/actions/gradle/experiment-1/action.yml
@@ -112,7 +112,7 @@ runs:
       shell: bash
     - name: Archive receipt
       id: upload-artifact
-      uses: actions/upload-artifact@v7
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
       if: always()
       with:
         name: experiment-1-receipt-${{ github.job }}${{ strategy.job-total > 1 && format('-{0}', strategy.job-index) || '' }}
diff --git a/.github/actions/gradle/experiment-2/action.yml b/.github/actions/gradle/experiment-2/action.yml
index 932e3bcb..c4e2e0be 100644
--- a/.github/actions/gradle/experiment-2/action.yml
+++ b/.github/actions/gradle/experiment-2/action.yml
@@ -120,7 +120,7 @@ runs:
       shell: bash
     - name: Archive receipt
       id: upload-artifact
-      uses: actions/upload-artifact@v7
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
       if: always()
       with:
         name: experiment-2-receipt-${{ github.job }}${{ strategy.job-total > 1 && format('-{0}', strategy.job-index) || '' }}
diff --git a/.github/actions/gradle/experiment-3/action.yml b/.github/actions/gradle/experiment-3/action.yml
index 639aac96..73912bd4 100644
--- a/.github/actions/gradle/experiment-3/action.yml
+++ b/.github/actions/gradle/experiment-3/action.yml
@@ -120,7 +120,7 @@ runs:
       shell: bash
     - name: Archive receipt
       id: upload-artifact
-      uses: actions/upload-artifact@v7
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
       if: always()
       with:
         name: experiment-3-receipt-${{ github.job }}${{ strategy.job-total > 1 && format('-{0}', strategy.job-index) || '' }}
diff --git a/.github/actions/gradle/experiment-config-cache/action.yml b/.github/actions/gradle/experiment-config-cache/action.yml
index 3a696a00..6667dc7b 100644
--- a/.github/actions/gradle/experiment-config-cache/action.yml
+++ b/.github/actions/gradle/experiment-config-cache/action.yml
@@ -13,7 +13,7 @@ runs:
   using: "composite"
   steps:
     - name: Set up Gradle
-      uses: gradle/actions/setup-gradle@v6
+      uses: gradle/actions/setup-gradle@50e97c2cd7a37755bbfafc9c5b7cafaece252f6e # v6
       with:
         cache-disabled: true
     - name: Run experiment
diff --git a/.github/actions/maven/experiment-1/action.yml b/.github/actions/maven/experiment-1/action.yml
index 284d3f67..09d21237 100644
--- a/.github/actions/maven/experiment-1/action.yml
+++ b/.github/actions/maven/experiment-1/action.yml
@@ -120,7 +120,7 @@ runs:
       shell: bash
     - name: Archive receipt
       id: upload-artifact
-      uses: actions/upload-artifact@v7
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
       if: always()
       with:
         name: experiment-1-receipt-${{ github.job }}${{ strategy.job-total > 1 && format('-{0}', strategy.job-index) || '' }}
diff --git a/.github/actions/maven/experiment-2/action.yml b/.github/actions/maven/experiment-2/action.yml
index de183316..c762a32f 100644
--- a/.github/actions/maven/experiment-2/action.yml
+++ b/.github/actions/maven/experiment-2/action.yml
@@ -120,7 +120,7 @@ runs:
       shell: bash
     - name: Archive receipt
       id: upload-artifact
-      uses: actions/upload-artifact@v7
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
       if: always()
       with:
         name: experiment-2-receipt-${{ github.job }}${{ strategy.job-total > 1 && format('-{0}', strategy.job-index) || '' }}
diff --git a/.github/workflows/build-verification.yml b/.github/workflows/build-verification.yml
index dd460e75..8710f0a0 100644
--- a/.github/workflows/build-verification.yml
+++ b/.github/workflows/build-verification.yml
@@ -14,9 +14,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Set up JDK 21
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           java-version: '21'
           distribution: 'adopt'
diff --git a/.github/workflows/cross-platform-testing-build-from-source.yml b/.github/workflows/cross-platform-testing-build-from-source.yml
index 9864f5c1..0bbae2b2 100644
--- a/.github/workflows/cross-platform-testing-build-from-source.yml
+++ b/.github/workflows/cross-platform-testing-build-from-source.yml
@@ -15,9 +15,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Set up JDK 21
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           java-version: '21'
           distribution: 'adopt'
@@ -28,7 +28,7 @@ jobs:
       - name: Build with Gradle
         run: ./gradlew build
       - name: Upload built script artifacts
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
         with:
           name: artifacts
           path: |
@@ -81,12 +81,12 @@ jobs:
           sudo apt-get install -y temurin-${{ matrix.java-version }}-jdk
       - name: Set up JDK ${{ matrix.java-version }}
         if: ${{ runner.os != 'Windows' }}
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           java-version: ${{ matrix.java-version }}
           distribution: ${{ matrix.os == 'macos-15' && 'zulu' || 'temurin' }} # No Temurin JDK 8 distribution for aarch64
       - name: Download built script artifacts
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           name: artifacts
       - name: Extract build validation scripts
diff --git a/.github/workflows/cross-platform-testing-use-development-release.yml b/.github/workflows/cross-platform-testing-use-development-release.yml
index 86399677..e08c91ea 100644
--- a/.github/workflows/cross-platform-testing-use-development-release.yml
+++ b/.github/workflows/cross-platform-testing-use-development-release.yml
@@ -56,7 +56,7 @@ jobs:
           sudo apt-get install -y temurin-${{ matrix.java-version }}-jdk
       - name: Set up JDK ${{ matrix.java-version }}
         if: ${{ runner.os != 'Windows' }}
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           java-version: ${{ matrix.java-version }}
           distribution: ${{ matrix.os == 'macos-15' && 'zulu' || 'temurin' }} # No Temurin JDK 8 distribution for aarch64
diff --git a/.github/workflows/development-release.yml b/.github/workflows/development-release.yml
index 17f14440..22308f3b 100644
--- a/.github/workflows/development-release.yml
+++ b/.github/workflows/development-release.yml
@@ -17,9 +17,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Set up JDK 21
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           java-version: '21'
           distribution: 'adopt'
diff --git a/.github/workflows/production-release.yml b/.github/workflows/production-release.yml
index 6ff4bb63..5a5ec234 100644
--- a/.github/workflows/production-release.yml
+++ b/.github/workflows/production-release.yml
@@ -17,9 +17,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Set up JDK 21
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
         with:
           java-version: '21'
           distribution: 'adopt'