diff --git a/.github/workflows/pr_tests.yml b/.github/workflows/pr_tests.yml
index 4365d16..7985263 100644
--- a/.github/workflows/pr_tests.yml
+++ b/.github/workflows/pr_tests.yml
@@ -26,4 +26,5 @@ jobs:
 
       - name: Run tests
         run: |
+          earthly config global.buildkit_max_parallelism 5
           earthly -P ./test+test