diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 98bf0f355..dc9d9b447 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -57,7 +57,7 @@ jobs:
     with:
       api_levels: '[35]' # Run only on API 35 for PRs
       test_flavors: 'google' # Run only Google flavor for PRs (faster)
-      num_shards: 2 # Run tests in parallel across 2 emulators
+      num_shards: 1 # Run tests in parallel across 1 emulator
     secrets: inherit
 
   # This job handles the case when no code changes are detected (docs-only PRs)