diff --git a/.github/workflows/draft-release.yaml b/.github/workflows/draft-release.yaml
index 15cdb1b..cb6ecc0 100644
--- a/.github/workflows/draft-release.yaml
+++ b/.github/workflows/draft-release.yaml
@@ -13,6 +13,6 @@ jobs:
 
     steps:
       - name: Run release drafter
-        uses: release-drafter/release-drafter@v6.0.0
+        uses: release-drafter/release-drafter@3f0f87098bd6b5c5b9a36d49c41d998ea58f9348 # v6.0.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/linting.yaml b/.github/workflows/linting.yaml
index 6d45dd8..1d651b2 100644
--- a/.github/workflows/linting.yaml
+++ b/.github/workflows/linting.yaml
@@ -16,14 +16,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Set up Poetry
         run: pipx install poetry
 
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: "poetry"
@@ -44,14 +44,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Set up Poetry
         run: pipx install poetry
 
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: "poetry"
@@ -75,14 +75,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Set up Poetry
         run: pipx install poetry
 
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: "poetry"
@@ -139,14 +139,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Set up Poetry
         run: pipx install poetry
 
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: "poetry"
@@ -167,14 +167,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Set up Poetry
         run: pipx install poetry
 
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: "poetry"
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 875975e..2549eb6 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -15,14 +15,14 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Set up Poetry
         run: pipx install poetry
 
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: "poetry"
diff --git a/.github/workflows/sync-labels.yaml b/.github/workflows/sync-labels.yaml
index 5b8d9fd..9d286b5 100644
--- a/.github/workflows/sync-labels.yaml
+++ b/.github/workflows/sync-labels.yaml
@@ -15,9 +15,9 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Run Label Syncer
-        uses: micnncim/action-label-syncer@v1.3.0
+        uses: micnncim/action-label-syncer@3abd5ab72fda571e69fffd97bd4e0033dd5f495c # v1.3.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 3f9be02..c94e166 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -19,14 +19,14 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Set up Poetry
         run: pipx install poetry
 
       - name: Set up Python ${{ matrix.python }}
         id: python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: ${{ matrix.python }}
           cache: "poetry"
@@ -43,7 +43,7 @@ jobs:
         run: poetry run pytest --cov certbot_dns_exonet tests
 
       - name: Upload coverage artifact
-        uses: actions/upload-artifact@v4.5.0
+        uses: actions/upload-artifact@6f51ac03b9356f520e9adb1b1b7802705f340c2b # v4.5.0
         with:
           name: coverage-${{ matrix.python }}
           path: .coverage
@@ -54,19 +54,19 @@ jobs:
     needs: pytest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           fetch-depth: 0
 
       - name: Download coverage data
-        uses: actions/download-artifact@v4.1.8
+        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
 
       - name: Set up Poetry
         run: pipx install poetry
 
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: "poetry"
@@ -85,4 +85,4 @@ jobs:
           poetry run coverage xml -i
 
       - name: Upload coverage report
-        uses: codecov/codecov-action@v5.1.2
+        uses: codecov/codecov-action@1e68e06f1dbfde0e4cefc87efeba9e4643565303 # v5.1.2
diff --git a/.github/workflows/typing.yaml b/.github/workflows/typing.yaml
index 19dbeb0..bcebfbf 100644
--- a/.github/workflows/typing.yaml
+++ b/.github/workflows/typing.yaml
@@ -17,14 +17,14 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Set up Poetry
         run: pipx install poetry
 
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: "poetry"
diff --git a/.github/workflows/verify-pr-labels.yaml b/.github/workflows/verify-pr-labels.yaml
index 8c0644c..a348e4e 100644
--- a/.github/workflows/verify-pr-labels.yaml
+++ b/.github/workflows/verify-pr-labels.yaml
@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Verify PR has a valid label
-        uses: jesusvasquez333/verify-pr-label-action@v1.4.0
+        uses: jesusvasquez333/verify-pr-label-action@657d111bbbe13e22bbd55870f1813c699bde1401 # v1.4.0
         with:
           pull-request-number: "${{ github.event.pull_request.number }}"
           github-token: "${{ secrets.GITHUB_TOKEN }}"