diff --git a/.github/workflows/check-template-branch.yml b/.github/workflows/check-template-branch.yml
index f407719..882f452 100644
--- a/.github/workflows/check-template-branch.yml
+++ b/.github/workflows/check-template-branch.yml
@@ -5,13 +5,16 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read
+
 jobs:
   check_template_branch:
     runs-on: ubuntu-latest
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Get create-hono version
         id: get_version
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 725299c..0ba2c2d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,9 @@ on:
   pull_request:
     branches: ['*']
 
+permissions:
+  contents: read
+
 jobs:
   ci:
     runs-on: ubuntu-latest
@@ -12,12 +15,12 @@ jobs:
       matrix:
         node-version: [20.x, 22.x, 24.x]
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
         with:
           node-version: ${{ matrix.node-version }}
-      - uses: oven-sh/setup-bun@v2
+      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
       - run: bun install
       - run: bun run format
       - run: bun run lint