diff --git a/phpstan.neon b/phpstan.neon
index 4594d0d2..eda92dbf 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -7,6 +7,8 @@ parameters:
     level: 6
     paths:
         - src
+    parallel:
+        maximumNumberOfProcesses: 1
 
     checkMissingIterableValueType: true
     checkGenericClassInNonGenericObjectType: false