diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index abbd4b1..66efe2b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,9 @@ on:
   pull_request:
     types: [ opened, reopened, synchronize, edited ]
 
+permissions:
+  contents: read
+
 jobs:
   main:
     runs-on: ubuntu-latest