diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 30b589c..ea90f9c 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -1,5 +1,8 @@
 name: Pull request
 
+permissions:
+  contents: read
+
 on:
   pull_request:
     types: [opened, reopened, synchronize]