diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 677c62205f..c74588cff3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,10 +29,10 @@ jobs:
       matrix:
         sdk: [stable, beta, dev]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v3.0.2
         with:
           submodules: recursive
-      - uses: dart-lang/setup-dart@v1
+      - uses: dart-lang/setup-dart@6a218f2413a3e78e9087f638a238f6b40893203d # v1.3
         with:
           sdk: ${{ matrix.sdk }}
       - run: dart pub get
@@ -50,20 +50,20 @@ jobs:
       FIREBASE_TOKEN: ${{ secrets.FIREBASE_TOKEN }}
       FIREBASE_PROJECT: default
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v3.0.2
         with:
           submodules: recursive
       - run: make build
       - run: make write-prod-robots
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@56337c425554a6be30cdef71bf441f15be286854 # v3.1.1
         with:
           node-version: ${{ env.NODE_VERSION }}
       - run: npm install -g firebase-tools
-      - uses: dart-lang/setup-dart@v1
+      - uses: dart-lang/setup-dart@6a218f2413a3e78e9087f638a238f6b40893203d # v1.3
         with:
           sdk: stable
       - run: tool/check-links.sh
-      - uses: FirebaseExtended/action-hosting-deploy@v0
+      - uses: FirebaseExtended/action-hosting-deploy@3a02c012c6a9b183828eeb456247327a894fc698
         with:
           repoToken: '${{ secrets.GITHUB_TOKEN }}'
           firebaseServiceAccount: '${{ secrets.FIREBASE_SERVICE_ACCOUNT_DART_DEV }}'
@@ -75,19 +75,19 @@ jobs:
     needs: test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v3.0.2
         with:
           submodules: recursive
       - run: make build
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@56337c425554a6be30cdef71bf441f15be286854 # v3.1.1
         with:
           node-version: ${{ env.NODE_VERSION }}
       - run: npm install -g firebase-tools
-      - uses: dart-lang/setup-dart@v1
+      - uses: dart-lang/setup-dart@6a218f2413a3e78e9087f638a238f6b40893203d # v1.3
         with:
           sdk: stable
       - run: tool/check-links.sh
-      - uses: FirebaseExtended/action-hosting-deploy@v0
+      - uses: FirebaseExtended/action-hosting-deploy@3a02c012c6a9b183828eeb456247327a894fc698
         with:
           repoToken: '${{ secrets.GITHUB_TOKEN }}'
           firebaseServiceAccount: '${{ secrets.FIREBASE_SERVICE_ACCOUNT_DART_DEV }}'
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index e386dbb8eb..dafce4d872 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -26,11 +26,11 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
+        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v3.0.2
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@7502d6e991ca767d2db617bfd823a1ed925a0d59
+        uses: github/codeql-action/init@7502d6e991ca767d2db617bfd823a1ed925a0d59 # v2.1.9
         with:
           languages: ${{ matrix.language }}
           # If you wish to specify custom queries, you can do so here or in a config file.
@@ -41,7 +41,7 @@ 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@7502d6e991ca767d2db617bfd823a1ed925a0d59
+        uses: github/codeql-action/autobuild@7502d6e991ca767d2db617bfd823a1ed925a0d59 # v2.1.9
 
       # ℹ️ Command-line programs to run using the OS shell.
       # 📚 https://git.io/JvXDl
@@ -55,4 +55,4 @@ jobs:
       #   make release
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@7502d6e991ca767d2db617bfd823a1ed925a0d59
\ No newline at end of file
+        uses: github/codeql-action/analyze@7502d6e991ca767d2db617bfd823a1ed925a0d59 # v2.1.9
diff --git a/.github/workflows/scorecards-analysis.yml b/.github/workflows/scorecards-analysis.yml
index 0c96f6ee35..543ab58596 100644
--- a/.github/workflows/scorecards-analysis.yml
+++ b/.github/workflows/scorecards-analysis.yml
@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846 # v3.0.0
+        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v3.0.2
         with:
           persist-credentials: false