diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 429796c3b6..47e8ad6494 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -418,7 +418,7 @@ jobs:
     timeout-minutes: 120
     env:
       DSH_COVERAGE_MAX_WORKERS: '6'
-      DSH_COVERAGE_PARTITIONS: '8'
+      DSH_COVERAGE_PARTITIONS: '4'
       # Instrumented process and polling fixtures can exceed Vitest's defaults
       # under the complete lane's concurrent gate load.
       DSH_COVERAGE_TEST_TIMEOUT_MS: '30000'