diff --git a/.github/workflows/add-preview.yml b/.github/workflows/add-preview.yml
index f778227..aa58543 100644
--- a/.github/workflows/add-preview.yml
+++ b/.github/workflows/add-preview.yml
@@ -14,11 +14,11 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@0717577d45739eb3c851188b29f50ed6c0b2194e # v2
 
       # Runs a single command using the runners shell
       - name: setup node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@f1f314fca9dfce2769ece7d933488f076716723e # v1
         with:
           node-version: 12.18.3
           
@@ -27,7 +27,7 @@ jobs:
       - run: yarn styleguide --buildDir ./docs
 
       - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@373f7f263a76c20808c831209c920827a82a2847 # v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./public
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index d0f8fb0..7230050 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -35,11 +35,11 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@0717577d45739eb3c851188b29f50ed6c0b2194e # v2
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v1
+      uses: github/codeql-action/init@231aa2c8a89117b126725a0e11897209b7118144 # v1
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -50,7 +50,7 @@ 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@v1
+      uses: github/codeql-action/autobuild@231aa2c8a89117b126725a0e11897209b7118144 # v1
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -64,4 +64,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v1
+      uses: github/codeql-action/analyze@231aa2c8a89117b126725a0e11897209b7118144 # v1
diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
index c5bd5e7..7b69210 100644
--- a/.github/workflows/reviewdog.yml
+++ b/.github/workflows/reviewdog.yml
@@ -6,27 +6,27 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@0717577d45739eb3c851188b29f50ed6c0b2194e # v2
         with:
           submodules: true
       - name: Setup node/npm
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@f1f314fca9dfce2769ece7d933488f076716723e # v1
         with:
           node-version: '15'
       - name: textlint-github-pr-check
-        uses: tsuyoshicho/action-textlint@v2
+        uses: tsuyoshicho/action-textlint@59452e704d2d25e4302d8056114d9cdbe8c9ff76 # v2
         with:
           github_token: ${{ secrets.github_token }}
           reporter: github-pr-check
           textlint_flags: "doc/**"
       - name: textlint-github-check
-        uses: tsuyoshicho/action-textlint@v2
+        uses: tsuyoshicho/action-textlint@59452e704d2d25e4302d8056114d9cdbe8c9ff76 # v2
         with:
           github_token: ${{ secrets.github_token }}
           reporter: github-check
           textlint_flags: "doc/**"
       - name: textlint-github-pr-review
-        uses: tsuyoshicho/action-textlint@v2
+        uses: tsuyoshicho/action-textlint@59452e704d2d25e4302d8056114d9cdbe8c9ff76 # v2
         with:
           github_token: ${{ secrets.github_token }}
           reporter: github-pr-review