diff --git a/.github/workflows/beta.yml b/.github/workflows/beta.yml
index e1d8effea..a88cd28e6 100644
--- a/.github/workflows/beta.yml
+++ b/.github/workflows/beta.yml
@@ -25,7 +25,7 @@ jobs:
       - uses: actions/setup-java@v1
         with:
           java-version: '12.x'
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@4389e6cbc6cb8a4b18c628ff96ff90be0e926aa8
         with:
           channel: ${{ matrix.flutter_version }}
       - run: ./tool/flutter_ci_script_${{ matrix.flutter_version }}.sh
@@ -43,7 +43,7 @@ jobs:
       - uses: actions/setup-java@v1
         with:
           java-version: '12.x'
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@4389e6cbc6cb8a4b18c628ff96ff90be0e926aa8
         with:
           channel: beta
       - run: ./tool/flutter_ci_script_stable.sh
@@ -56,7 +56,7 @@ jobs:
       - uses: actions/setup-java@v1
         with:
           java-version: '12.x'
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@4389e6cbc6cb8a4b18c628ff96ff90be0e926aa8
         with:
           channel: beta
       - run: ./tool/android_ci_script.sh
@@ -69,7 +69,7 @@ jobs:
       - uses: actions/setup-java@v1
         with:
           java-version: '12.x'
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@4389e6cbc6cb8a4b18c628ff96ff90be0e926aa8
         with:
           channel: beta
       - run: ./tool/ios_ci_script.sh
diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index ad41133fc..aeb58c542 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -14,7 +14,7 @@ jobs:
           submodules: true
           fetch-depth: 0
 
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@4389e6cbc6cb8a4b18c628ff96ff90be0e926aa8
 
       - name: Init scripts
         run: dart pub get
@@ -25,7 +25,7 @@ jobs:
         working-directory: web
 
       - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@068dc23d9710f1ba62e86896f84735d869951305
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: web/samples_index/public
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7b059556e..3c6649785 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -27,7 +27,7 @@ jobs:
       - uses: actions/setup-java@v1
         with:
           java-version: '12.x'
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@4389e6cbc6cb8a4b18c628ff96ff90be0e926aa8
         with:
           channel: ${{ matrix.flutter_version }}
       - run: ./tool/flutter_ci_script_${{ matrix.flutter_version }}.sh
@@ -38,7 +38,7 @@ jobs:
       - uses: actions/setup-java@v1
         with:
           java-version: '12.x'
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@4389e6cbc6cb8a4b18c628ff96ff90be0e926aa8
         with:
           channel: stable
       - run: ./tool/android_ci_script.sh
@@ -49,7 +49,7 @@ jobs:
       - uses: actions/setup-java@v1
         with:
           java-version: '12.x'
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@4389e6cbc6cb8a4b18c628ff96ff90be0e926aa8
         with:
           channel: stable
       - run: ./tool/ios_ci_script.sh
diff --git a/.github/workflows/verify-web-demos.yml b/.github/workflows/verify-web-demos.yml
index c7aacf9a8..111b664c4 100644
--- a/.github/workflows/verify-web-demos.yml
+++ b/.github/workflows/verify-web-demos.yml
@@ -9,7 +9,7 @@ jobs:
         with:
           submodules: true
           fetch-depth: 0
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@4389e6cbc6cb8a4b18c628ff96ff90be0e926aa8
         with:
           channel: stable
       - name: Init scripts