diff --git a/.github/workflows/build-check.yml b/.github/workflows/build-check.yml
index b9096601..fd17458b 100644
--- a/.github/workflows/build-check.yml
+++ b/.github/workflows/build-check.yml
@@ -6,6 +6,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read
+
 jobs:
   compile:
     strategy:
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index e38d408b..fc85e589 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -12,6 +12,11 @@ concurrency:
   group: codeql-${{ github.ref_name }}
   cancel-in-progress: true
 
+permissions:
+  actions: read
+  contents: read
+  security-events: write   # github/codeql-action/upload posts SARIF results
+
 jobs:
   codeql-analyze:
     runs-on: ubuntu-latest