diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index b06ab11da..3d22cbd9e 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -12,6 +12,9 @@ on:
       - '**.md'
       - 'LICENSE'
 
+permissions:
+  contents: read
+
 jobs:
   linux:
     runs-on: ubuntu-latest
@@ -27,7 +30,7 @@ jobs:
           - GCC
           - CLANG
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: install build dependencies
       run: |
         sudo apt-get update
@@ -73,7 +76,7 @@ jobs:
           - GCC
           - CLANG
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: build and test
       shell: bash
       run: |
diff --git a/.github/workflows/ci-fuzz.yml b/.github/workflows/ci-fuzz.yml
index 9e8be0bc1..716855a9b 100644
--- a/.github/workflows/ci-fuzz.yml
+++ b/.github/workflows/ci-fuzz.yml
@@ -1,5 +1,8 @@
 name: CIFuzz
 on: [pull_request]
+
+permissions:
+  contents: read
 jobs:
   Fuzzing:
     runs-on: ubuntu-latest