diff --git a/.github/workflows/lock.yaml b/.github/workflows/lock.yaml
index 94f2600dac..92f4cde588 100644
--- a/.github/workflows/lock.yaml
+++ b/.github/workflows/lock.yaml
@@ -13,6 +13,7 @@ jobs:
     steps:
       - uses: dessant/lock-threads@486f7380c15596f92b724e4260e4981c68d6bde6
         with:
+          process-only: 'issues'
           github-token: ${{ github.token }}
           # Number of days of inactivity before a closed issue is locked.
           issue-lock-inactive-days: '14'