diff --git a/.github/workflows/lock.yml b/.github/workflows/lock.yml
index c6691e46..a4d3e9b5 100644
--- a/.github/workflows/lock.yml
+++ b/.github/workflows/lock.yml
@@ -4,8 +4,14 @@ on:
   schedule:
     - cron: '0 0 * * *'
 
+permissions:
+  contents: read
+
 jobs:
   lock:
+    permissions:
+      issues: write  # for dessant/lock-threads to lock issues
+      pull-requests: write  # for dessant/lock-threads to lock PRs
     runs-on: ubuntu-latest
     steps:
       - uses: dessant/lock-threads@v2