diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4e32349432..4122f62d61 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -426,7 +426,7 @@ jobs:
         if: ${{ matrix.job.postgres-version }}
         timeout-minutes: 2
         run: until pg_isready -h localhost; do sleep 1; done
-      - run: poetry run trial --jobs=6 tests
+      - run: poetry run trial tests
         env:
           SYNAPSE_POSTGRES: ${{ matrix.job.database == 'postgres' || '' }}
           SYNAPSE_POSTGRES_HOST: /var/run/postgresql