diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6a8773b97..e8585e9b6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -90,7 +90,9 @@ jobs:
     runs-on:
       group: databricks-protected-runner-group
       labels: linux-ubuntu-latest
-    timeout-minutes: 20
+    # Coverage instrumentation slows the unit suite; give it more headroom
+    # than the other 20-minute unit jobs.
+    timeout-minutes: 30
 
     permissions:
       id-token: write