diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 361d457acea..1bc250dfd02 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -13,7 +13,7 @@ jobs:
       - name: Install dependencies
         run: sudo apt update && sudo apt install -y uncrustify
       - name: Checkout OpenVPN
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
         with:
           path: openvpn
       - name: Show uncrustify version
@@ -27,7 +27,7 @@ jobs:
       - name: Show changes on standard output
         run: git diff
         working-directory: openvpn
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4
         with:
           name: uncrustify-changes.patch
           path: 'openvpn/uncrustify-changes.patch'
@@ -49,22 +49,22 @@ jobs:
       - name: Install dependencies
         run: sudo apt update && sudo apt install -y mingw-w64 unzip cmake ninja-build build-essential wget python3-docutils man2html-base
       - name: Checkout OpenVPN
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
 
       - name: Restore from cache and install vcpkg
-        uses: lukka/run-vcpkg@v11.5
+        uses: lukka/run-vcpkg@5e0cab206a5ea620130caf672fce3e4a6b5666a1 # v11.5
         with:
           vcpkgGitCommitId: 8d3649ba34aab36914ddd897958599aa0a91b08e
           vcpkgJsonGlob: '**/mingw/vcpkg.json'
 
       - name: Run CMake with vcpkg.json manifest
-        uses: lukka/run-cmake@v10.7
+        uses: lukka/run-cmake@af1be47fd7c933593f687731bc6fdbee024d3ff4 # v10.8
         with:
           configurePreset: mingw-${{ matrix.arch }}
           buildPreset: mingw-${{ matrix.arch }}
           buildPresetAdditionalArgs: "['--config Debug']"
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4
         with:
           name: openvpn-mingw-${{ matrix.arch }}
           path: |
@@ -72,7 +72,7 @@ jobs:
             ${{ github.workspace }}/out/build/mingw/${{ matrix.arch }}/Debug/*.dll
             !${{ github.workspace }}/out/build/mingw/${{ matrix.arch }}/Debug/test_*.exe
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4
         with:
           name: openvpn-mingw-${{ matrix.arch }}-tests
           path: |
@@ -91,9 +91,9 @@ jobs:
     name: "mingw unittest ${{ matrix.test }} - ${{ matrix.arch }} - OSSL"
     steps:
       - name: Checkout OpenVPN
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
       - name: Retrieve mingw unittest
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4
         with:
           name: openvpn-mingw-${{ matrix.arch }}-tests
           path: unittests
@@ -165,7 +165,7 @@ jobs:
       - name: Install dependencies
         run: sudo apt update && sudo apt install -y liblzo2-dev libpam0g-dev liblz4-dev libcap-ng-dev libnl-genl-3-dev linux-libc-dev man2html libcmocka-dev python3-docutils libtool automake autoconf ${SSLPKG} ${PKCS11PKG}
       - name: Checkout OpenVPN
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
       - name: autoconf
         run: autoreconf -fvi
       - name: configure
@@ -195,7 +195,7 @@ jobs:
       - name: Install dependencies
         run: sudo apt update && sudo apt install -y liblzo2-dev libpam0g-dev liblz4-dev libcap-ng-dev libnl-genl-3-dev linux-libc-dev man2html clang libcmocka-dev python3-docutils libtool automake autoconf libmbedtls-dev
       - name: Checkout OpenVPN
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
       - name: autoconf
         run: autoreconf -fvi
       - name: configure
@@ -256,7 +256,7 @@ jobs:
       - name: Install dependencies
         run: brew install openssl@1.1 openssl@3 lzo lz4 man2html cmocka libtool automake autoconf libressl
       - name: Checkout OpenVPN
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
       - name: autoconf
         run: autoreconf -fvi
       - name: configure
@@ -280,27 +280,27 @@ jobs:
 
       runs-on: windows-latest
       steps:
-      - uses: actions/checkout@v4
-      - uses: lukka/get-cmake@v3.30.1
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
+      - uses: lukka/get-cmake@070a0507a7abe157ef918deec391da1be197d2d1 # v3.30.3
 
       - name: Install rst2html
         run: python -m pip install --upgrade pip docutils
 
       - name: Restore artifacts, or setup vcpkg (do not install any package)
-        uses: lukka/run-vcpkg@v11.5
+        uses: lukka/run-vcpkg@5e0cab206a5ea620130caf672fce3e4a6b5666a1 # v11.5
         with:
           vcpkgGitCommitId: 8d3649ba34aab36914ddd897958599aa0a91b08e
           vcpkgJsonGlob: '**/windows/vcpkg.json'
 
       - name: Run CMake with vcpkg.json manifest (NO TESTS)
-        uses: lukka/run-cmake@v10.7
+        uses: lukka/run-cmake@af1be47fd7c933593f687731bc6fdbee024d3ff4 # v10.8
         if: ${{ matrix.arch == 'arm64' }}
         with:
           configurePreset: win-${{ matrix.arch }}-release
           buildPreset: win-${{ matrix.arch }}-release
 
       - name: Run CMake with vcpkg.json manifest
-        uses: lukka/run-cmake@v10.7
+        uses: lukka/run-cmake@af1be47fd7c933593f687731bc6fdbee024d3ff4 # v10.8
         if: ${{ matrix.arch != 'arm64' }}
         with:
           configurePreset: win-${{ matrix.arch }}-release
@@ -308,7 +308,7 @@ jobs:
           testPreset: win-${{ matrix.arch }}-release
           testPresetAdditionalArgs: "['--output-on-failure']"
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4
         with:
           name: openvpn-msvc-${{ matrix.arch }}
           path: |
@@ -348,7 +348,7 @@ jobs:
       - name: Install dependencies
         run: sudo apt update && sudo apt install -y liblzo2-dev libpam0g-dev liblz4-dev linux-libc-dev man2html clang libcmocka-dev python3-docutils libtool automake autoconf pkg-config libcap-ng-dev libnl-genl-3-dev
       - name: "libressl: checkout"
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
         with:
           path: libressl
           # versioning=semver-coerced
@@ -369,7 +369,7 @@ jobs:
       - name: "ldconfig"
         run: sudo ldconfig
       - name: Checkout OpenVPN
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
       - name: autoconf
         run: autoreconf -fvi
       - name: configure
@@ -410,7 +410,7 @@ jobs:
       - name: Install dependencies
         run: sudo apt update && sudo apt install -y liblzo2-dev libpam0g-dev liblz4-dev linux-libc-dev man2html clang libcmocka-dev python3-docutils python3-jinja2 python3-jsonschema libtool automake autoconf pkg-config libcap-ng-dev libnl-genl-3-dev
       - name: "mbedtls: checkout"
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
         with:
           path: mbedtls
           submodules: true
@@ -424,7 +424,7 @@ jobs:
         run: sudo make install DESTDIR=/usr
         working-directory: mbedtls
       - name: Checkout OpenVPN
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
       - name: autoconf
         run: autoreconf -fvi
       - name: configure
diff --git a/.github/workflows/coverity-scan.yml b/.github/workflows/coverity-scan.yml
index 37b8102eb21..16c979ddcf5 100644
--- a/.github/workflows/coverity-scan.yml
+++ b/.github/workflows/coverity-scan.yml
@@ -13,7 +13,7 @@ jobs:
     steps:
       - name: Check submission cache
         id: check_submit
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4
         with:
           path: |
             cov-int
@@ -25,7 +25,7 @@ jobs:
 
       - name: Checkout OpenVPN
         if: steps.check_submit.outputs.cache-hit != 'true'
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
 
       - name: Download Coverity Build Tool
         if: steps.check_submit.outputs.cache-hit != 'true'
@@ -65,7 +65,7 @@ jobs:
 
       - name: Cache submission
         if: steps.check_submit.outputs.cache-hit != 'true'
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4
         with:
           path: |
             cov-int