diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 01f69bd..990cbb0 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -2,11 +2,14 @@ name: Build & Test
 
 on: [pull_request, push]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
       - name: Build builder image
         run: |
           builder/build_docker_image
@@ -14,12 +17,12 @@ jobs:
         run: |
           builder/build
       - name: Upload build
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
         with:
           name: svr-info
           path: dist/svr-info*.tgz
       - name: Upload oss package
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
         with:
           name: oss_source
           path: dist/oss_source.tgz
@@ -28,9 +31,9 @@ jobs:
     needs: [build]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
       - name: download svr-info
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@9bc31d5ccc31df68ecc42ccf4149144866c47d8a # v3.0.2
         with:
           name: svr-info
       - name: install jq
@@ -59,7 +62,7 @@ jobs:
           # TODO: add more tests here
       - name: upload report
         if: ${{ always() }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
         with:
           name: ${{ matrix.runner }} report
           path: svr-info/output/
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index b85129f..9e0a0ef 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -9,6 +9,9 @@ on:
   schedule:
     - cron: '36 18 * * 3'
 
+permissions:
+  contents: read
+
 jobs:
   analyze:
     name: Analyze
@@ -24,10 +27,10 @@ jobs:
         language: [ 'cpp', 'go' ]
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@1500a131381b66de0c52ac28abb13cd79f4b7ecc # v2.22.12
       with:
         languages: ${{ matrix.language }}
     - name: Build golang
@@ -41,6 +44,6 @@ jobs:
         cd src/calcfreq/
         make
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@1500a131381b66de0c52ac28abb13cd79f4b7ecc # v2.22.12
       with:
         category: "/language:${{matrix.language}}"