diff --git a/Dockerfile b/Dockerfile
index 0c7c2e9..67ff021 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM nxtlvlsoftware/pmmp-phpstan:master
+FROM nxtlvlsoftware/pmmp-phpstan:4
 
 USER root