diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 27d028e..2483eac 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ on:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
 
 permissions: # needed to allow julia-actions/cache to delete old caches that it has created
   actions: write