diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index f21de8e..b71758d 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -21,7 +21,7 @@ jobs:
     outputs:
       deps_cache_key: ${{ steps.cache-key.outputs.deps_cache_key }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
@@ -31,7 +31,7 @@ jobs:
 
       - name: Try to get cached BlazingMQ build artifacts
         id: cache-restore
-        uses: actions/cache/restore@v6
+        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: blazingmq_artifacts.tar.gz
           key: ${{ steps.cache-key.outputs.deps_cache_key }}
@@ -80,7 +80,7 @@ jobs:
       - name: Cache built BlazingMQ build artifacts
         id: cache-save
         if: steps.cache-restore.outputs.cache-hit != 'true'
-        uses: actions/cache/save@v6
+        uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: blazingmq_artifacts.tar.gz
           key: ${{ steps.cache-key.outputs.deps_cache_key }}
@@ -99,12 +99,12 @@ jobs:
           - "3.13"
           - "3.14"
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Try to get cached BlazingMQ build artifacts
         id: cache-restore
-        uses: actions/cache/restore@v6
+        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: blazingmq_artifacts.tar.gz
           key: ${{ needs.blazingmq-dependency.outputs.deps_cache_key }}
@@ -136,7 +136,7 @@ jobs:
             libgmock-dev \
             libz-dev
       - name: Log in to GHCR
-        uses: docker/login-action@v4
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -189,12 +189,12 @@ jobs:
     needs: blazingmq-dependency
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Try to get cached BlazingMQ build artifacts
         id: cache-restore
-        uses: actions/cache/restore@v6
+        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: blazingmq_artifacts.tar.gz
           key: ${{ needs.blazingmq-dependency.outputs.deps_cache_key }}
@@ -237,12 +237,12 @@ jobs:
     needs: blazingmq-dependency
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
       - name: Try to get cached BlazingMQ build artifacts
         id: cache-restore
-        uses: actions/cache/restore@v6
+        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: blazingmq_artifacts.tar.gz
           key: ${{ needs.blazingmq-dependency.outputs.deps_cache_key }}
@@ -263,7 +263,7 @@ jobs:
           sudo chmod 777 /cores
           echo "/cores/%e.%p.%s.%t" | sudo tee /proc/sys/kernel/core_pattern
       - name: Log in to GHCR
-        uses: docker/login-action@v4
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -292,7 +292,7 @@ jobs:
         if: always()
         run: docker rm -f bmqbrkr
       - name: Output code coverage summary
-        uses: irongut/CodeCoverageSummary@v1.3.0
+        uses: irongut/CodeCoverageSummary@51cc3a756ddcd398d447c044c02cb6aa83fdae95 # v1.3.0
         with:
           filename: coverage*.xml
       - name: Upload broker logs as artifacts
@@ -301,7 +301,7 @@ jobs:
           mkdir -p bmq/logs
           docker logs bmqbrkr > bmq/logs/broker_stdout.log 2> bmq/logs/broker_stderr.log || true
           docker cp bmqbrkr:/var/local/bmq/logs/. bmq/logs/ || true
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         if: failure()
         with:
           name: broker_logs
@@ -310,7 +310,7 @@ jobs:
           compression-level: 9
       - name: Upload broker core dump as artifacts
         if: failure()
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: core_dumps
           path: /cores
diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index 30e8382..ffc28f7 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -24,7 +24,7 @@ jobs:
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
@@ -36,17 +36,17 @@ jobs:
           BLAZINGMQ_PYTHON_NO_PKGCONFIG: '1'
         run: uv build --sdist
 
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: dist-sdist
           path: dist
 
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: tests-sdist
           path: tests
 
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: bin-sdist
           path: bin
@@ -73,15 +73,15 @@ jobs:
         cibw_arch: ${{ fromJSON(needs.choose_architectures.outputs.cibw_arches) }}
 
     steps:
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
         with:
           name: dist-sdist
           path: dist
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
         with:
           name: tests-sdist
           path: tests
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
         with:
           name: bin-sdist
           path: bin
@@ -92,13 +92,13 @@ jobs:
         run: |
           echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope
       - name: Build wheels
-        uses: pypa/cibuildwheel@v4.2.1
+        uses: pypa/cibuildwheel@e090b81e30c4d855ea63bf4b6e59204c09a101ae # v4.2.1
         env:
           CIBW_ARCHS_LINUX: ${{ matrix.cibw_arch }}
           CIBW_BUILD: ${{ matrix.cibw_python }}-*
           CIBW_TEST_COMMAND: python3 -m pytest {project}/tests/unit
           CIBW_TEST_REQUIRES: pytest mock pkgconfig
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: dist-Linux-${{ matrix.cibw_python }}-${{ matrix.cibw_arch }}
           path: ./wheelhouse/*.whl
@@ -116,15 +116,15 @@ jobs:
         cibw_arch: ["arm64"]
 
     steps:
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
         with:
           name: dist-sdist
           path: dist
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
         with:
           name: tests-sdist
           path: tests
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
         with:
           name: bin-sdist
           path: bin
@@ -136,7 +136,7 @@ jobs:
         run: |
           echo "CFLAGS=-target arm64-apple-macos14" >> $GITHUB_ENV
       - name: Build wheels
-        uses: pypa/cibuildwheel@v4.2.1
+        uses: pypa/cibuildwheel@e090b81e30c4d855ea63bf4b6e59204c09a101ae # v4.2.1
         env:
           CIBW_ARCHS_MACOS: ${{ matrix.cibw_arch }}
           CIBW_BUILD: ${{ matrix.cibw_python }}-*
@@ -146,7 +146,7 @@ jobs:
           MACOSX_DEPLOYMENT_TARGET: "14.0"
           SYSTEM_VERSION_COMPAT: 0
 
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: dist-MacOS-${{ matrix.cibw_python }}-${{ matrix.cibw_arch }}
           path: ./wheelhouse/*.whl
@@ -155,7 +155,7 @@ jobs:
     needs: [build_wheels, build_wheels_macos, build_sdist]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/upload-artifact/merge@v7
+      - uses: actions/upload-artifact/merge@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: dist
           pattern: dist-*
@@ -167,11 +167,11 @@ jobs:
       github.event_name == 'release' && github.event.action == 'published'
         || github.event_name == 'workflow_dispatch'
     steps:
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
         with:
           name: dist
           path: dist
-      - uses: pypa/gh-action-pypi-publish@release/v1
+      - uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # v1.14.2
         with:
           skip_existing: true
           password: ${{ secrets.PYPI_PASSWORD }}
diff --git a/.github/workflows/codeql.yaml b/.github/workflows/codeql.yaml
index 1874522..f60da69 100644
--- a/.github/workflows/codeql.yaml
+++ b/.github/workflows/codeql.yaml
@@ -34,18 +34,18 @@ jobs:
           - actions
           - python
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v4
+        uses: github/codeql-action/init@6f2ac81f5cd81fe351a197ba0b00d91d03cd2aee # v4.39.0
         with:
           languages: ${{ matrix.language }}
           build-mode: none
 
       - name: Perform CodeQL analysis
-        uses: github/codeql-action/analyze@v4
+        uses: github/codeql-action/analyze@6f2ac81f5cd81fe351a197ba0b00d91d03cd2aee # v4.39.0
         with:
           category: /language:${{ matrix.language }}
 
@@ -57,7 +57,7 @@ jobs:
     outputs:
       deps_cache_key: ${{ steps.cache-key.outputs.deps_cache_key }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
@@ -67,7 +67,7 @@ jobs:
 
       - name: Try to get cached BlazingMQ build artifacts
         id: cache-restore
-        uses: actions/cache/restore@v6
+        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: blazingmq_artifacts.tar.gz
           key: ${{ steps.cache-key.outputs.deps_cache_key }}
@@ -116,7 +116,7 @@ jobs:
       - name: Cache built BlazingMQ build artifacts
         id: cache-save
         if: steps.cache-restore.outputs.cache-hit != 'true'
-        uses: actions/cache/save@v6
+        uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: blazingmq_artifacts.tar.gz
           key: ${{ steps.cache-key.outputs.deps_cache_key }}
@@ -129,13 +129,13 @@ jobs:
       contents: read
       security-events: write
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
       - name: Try to get cached BlazingMQ build artifacts
         id: cache-restore
-        uses: actions/cache/restore@v6
+        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: blazingmq_artifacts.tar.gz
           key: ${{ needs.blazingmq-dependency.outputs.deps_cache_key }}
@@ -173,7 +173,7 @@ jobs:
             libz-dev
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v4
+        uses: github/codeql-action/init@6f2ac81f5cd81fe351a197ba0b00d91d03cd2aee # v4.39.0
         with:
           languages: c-cpp
           build-mode: manual
@@ -190,7 +190,7 @@ jobs:
       # filters do not apply to built languages. So analyze without uploading,
       # drop the generated file's alerts, and upload the remainder.
       - name: Perform CodeQL analysis
-        uses: github/codeql-action/analyze@v4
+        uses: github/codeql-action/analyze@6f2ac81f5cd81fe351a197ba0b00d91d03cd2aee # v4.39.0
         with:
           category: /language:c-cpp
           output: sarif-results
@@ -227,7 +227,7 @@ jobs:
           done
 
       - name: Upload CodeQL results
-        uses: github/codeql-action/upload-sarif@v4
+        uses: github/codeql-action/upload-sarif@6f2ac81f5cd81fe351a197ba0b00d91d03cd2aee # v4.39.0
         with:
           sarif_file: sarif-results
           category: /language:c-cpp
diff --git a/.github/workflows/dco-check.yaml b/.github/workflows/dco-check.yaml
index e9fa601..7d9b49d 100644
--- a/.github/workflows/dco-check.yaml
+++ b/.github/workflows/dco-check.yaml
@@ -20,10 +20,10 @@ jobs:
     steps:
       - name: Get PR Commits
         id: "get-pr-commits"
-        uses: tim-actions/get-pr-commits@master
+        uses: tim-actions/get-pr-commits@198af03565609bb4ed924d1260247b4881f09e7d  # 26 Feb 2024
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: DCO Check
-        uses: tim-actions/dco@master
+        uses: tim-actions/dco@f2279e6e62d5a7d9115b0cb8e837b777b1b02e21  # 10 Jun 2021
         with:
           commits: ${{ steps.get-pr-commits.outputs.commits }}
diff --git a/.github/workflows/news-check.yaml b/.github/workflows/news-check.yaml
index 4600fd6..0e75a7c 100644
--- a/.github/workflows/news-check.yaml
+++ b/.github/workflows/news-check.yaml
@@ -16,7 +16,7 @@ jobs:
     name: Check for news entry
     steps:
       - name: "Check for news entry"
-        uses: brettcannon/check-for-changed-files@v1
+        uses: brettcannon/check-for-changed-files@d85c64d17b3c1d0ac57c9cc46ea39399b0d6fa71 # v1.2.2
         with:
           file-pattern: "news/*.rst"
           skip-label: "skip news"