diff --git a/chapter12/Dockerfile b/chapter12/Dockerfile
index 7b9f39ef..3c6a9e32 100644
--- a/chapter12/Dockerfile
+++ b/chapter12/Dockerfile
@@ -1,6 +1,6 @@
 FROM alpine 
 
-RUN groupadd -r secureusers && useradd -r -g secureusers secureuser 
+RUN addgroup -S secureusers && adduser -S secureuser -G secureusers
 
 #Execute any root commands prior to needing to switch users