diff --git a/docker/docker-compose.yaml b/docker/docker-compose.yaml
index 9789f7a2d..6269e953b 100644
--- a/docker/docker-compose.yaml
+++ b/docker/docker-compose.yaml
@@ -28,7 +28,7 @@ services:
 
   test:
     <<: *common
-    command: /bin/bash -xcl "swift test -Xswiftc -warnings-as-errors $${SANITIZER_ARG-}"
+    command: /bin/bash -xcl "swift test --parallel -Xswiftc -warnings-as-errors $${SANITIZER_ARG-}"
 
   # util