diff --git a/Makefile b/Makefile
index 9180948..de0e132 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@ migrate: ## Migrate the wagtail bakery site migrations
 	docker compose exec web python manage.py migrate
 
 test: ## Run all wagtail tests or pass in a file with `make test file=wagtail.admin.tests.test_name`
-	docker compose exec -w /code/wagtail web python runtests.py $(file) $(FILE)
+	docker compose exec -w /code/wagtail web python runtests.py $(file) $(FILE) --parallel
 
 format-wagtail: ## Format Wagtail repo
 	docker compose exec -w /code/wagtail web make format-server
diff --git a/README.md b/README.md
index 0dbbbc3..4bbc108 100644
--- a/README.md
+++ b/README.md
@@ -142,7 +142,7 @@ make test
 or
 
 ```sh
-docker compose exec -w /code/wagtail web python runtests.py
+docker compose exec -w /code/wagtail web python runtests.py --parallel
 ```
 
 ### Run tests for a specific file