diff --git a/grumphp.yml.dist b/grumphp.yml.dist
index 91b29fe..d7dd2f9 100644
--- a/grumphp.yml.dist
+++ b/grumphp.yml.dist
@@ -7,7 +7,7 @@ parameters:
     phpspec:
       verbose: true
     infection:
-      threads: 1
+      threads: 4
       test_framework: phpspec
       configuration: infection.json.dist
       min_msi: 50