diff --git a/ci/haskell.yml b/ci/haskell.yml
index 827d177..5693f90 100644
--- a/ci/haskell.yml
+++ b/ci/haskell.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ $default-branch ]
 
+permissions:
+  contents: read
+
 jobs:
   build: