diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a8717d7f..0c9f3f15 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,6 +8,9 @@ on:
   schedule:
     - cron: "0 12 * * 1"
 
+permissions:
+  contents: read
+
 env:
   CARGO_INCREMENTAL: 0
   RUSTFLAGS: "-Dwarnings"