diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4183d4d..7870d9c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,11 @@ on:
   push:
     branches: [main]
 
+# Every job only reads the repo (checkout, install, build, lint, test, cdk synth);
+# none write, release, or assume AWS. Pin the default GITHUB_TOKEN to read-only.
+permissions:
+  contents: read
+
 jobs:
   web:
     runs-on: ubuntu-latest