diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a4bad07..d023079 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,6 +6,10 @@ on:
   push:
     branches: [main]
 
+# The job only reads the repo; the token gets nothing more.
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest