diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index f6a88f020..2261ae61b 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -39,10 +39,10 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v2
+        uses: github/codeql-action/init@8aad20d150bbac5944a9f9d289da16a4b0d87c1e  # v4.36.2
         with:
           languages: ${{ matrix.language }}
           # If you wish to specify custom queries, you can do so here or in a config file.
@@ -55,7 +55,7 @@ jobs:
       # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
       # If this step fails, then you should remove it and run the build manually (see below)
       - name: Autobuild
-        uses: github/codeql-action/autobuild@v2
+        uses: github/codeql-action/autobuild@8aad20d150bbac5944a9f9d289da16a4b0d87c1e  # v4.36.2
 
       # ℹ️ Command-line programs to run using the OS shell.
       # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
@@ -67,4 +67,4 @@ jobs:
       #   echo "Run, Build Application using script"
       #   ./location_of_script_within_repo/buildscript.sh
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v2
+        uses: github/codeql-action/analyze@8aad20d150bbac5944a9f9d289da16a4b0d87c1e  # v4.36.2
diff --git a/.github/workflows/pypi-publish.yml b/.github/workflows/pypi-publish.yml
index 545c0cd43..ea6264ead 100644
--- a/.github/workflows/pypi-publish.yml
+++ b/.github/workflows/pypi-publish.yml
@@ -12,8 +12,8 @@ jobs:
       id-token: write
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.11'
           cache: 'pip'
@@ -21,8 +21,14 @@ jobs:
         run: |
           pip install build
           python -m build
+      # NOTE: We deliberately pin this action to a commit SHA rather than the
+      #       mutable `@release/v1` ref that PyPA recommends. The pin stops the
+      #       action from being swapped out from under a workflow that holds PyPI
+      #       publish (OIDC) rights; the cost is losing automatic upstream patches.
+      #       Renovate offsets that by bumping the pinned SHA (tracked via the
+      #       trailing `# vX.Y.Z` comment), so merge those bump PRs promptly.
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b  # v1.14.0
   pypi-publish-pytest-taskgraph:
     name: upload release to PyPI
     if: startsWith(github.ref, 'refs/tags/pytest-taskgraph')
@@ -32,8 +38,8 @@ jobs:
       id-token: write
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.11'
           cache: 'pip'
@@ -43,7 +49,7 @@ jobs:
           pip install build
           python -m build
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b  # v1.14.0
         with:
           packages-dir: packages/pytest-taskgraph/dist
   pypi-publish-sphinx-taskgraph:
@@ -55,8 +61,8 @@ jobs:
       id-token: write
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.11'
           cache: 'pip'
@@ -66,6 +72,6 @@ jobs:
           pip install build
           python -m build
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b  # v1.14.0
         with:
           packages-dir: packages/sphinx-taskgraph/dist