diff --git a/.github/workflows/buf.yml b/.github/workflows/buf.yml
index bc1905a..756d347 100644
--- a/.github/workflows/buf.yml
+++ b/.github/workflows/buf.yml
@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # renovate: tag=v2
 
       # 2: Setup Buf.
-      - uses: bufbuild/buf-setup-action@v1.8.0
+      - uses: bufbuild/buf-setup-action@ebfad693a1cf43c5a8fc187a3f6ffc9d4b5dea8f # v1.8.0
         with:
           github_token: ${{ github.token }}
 
@@ -26,7 +26,7 @@ jobs:
       - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # renovate: tag=v2
 
       # 2: Setup Buf.
-      - uses: bufbuild/buf-setup-action@v1.8.0
+      - uses: bufbuild/buf-setup-action@ebfad693a1cf43c5a8fc187a3f6ffc9d4b5dea8f # v1.8.0
         with:
           github_token: ${{ github.token }}
 
@@ -50,7 +50,7 @@ jobs:
       - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # renovate: tag=v2
 
       # 2: Setup Buf.
-      - uses: bufbuild/buf-setup-action@v1.8.0
+      - uses: bufbuild/buf-setup-action@ebfad693a1cf43c5a8fc187a3f6ffc9d4b5dea8f # v1.8.0
         with:
           github_token: ${{ github.token }}
 
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 16616fb..b7631bf 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -38,11 +38,11 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@dc323e67f16fb5f7663d20ff7941f27f5809e9b6 # v2
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v1
+      uses: github/codeql-action/init@4b3fd9198891cf782111537728021ffc6ae722ba # v1
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -67,4 +67,4 @@ jobs:
 #     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v1
+      uses: github/codeql-action/analyze@4b3fd9198891cf782111537728021ffc6ae722ba # v1