diff --git a/samples/react-express-mysql/README.md b/samples/react-express-mysql/README.md
index c87194a..55e1af5 100644
--- a/samples/react-express-mysql/README.md
+++ b/samples/react-express-mysql/README.md
@@ -23,7 +23,7 @@ services:
     build: backend
     ...
   db:
-    image: postgres
+    image: mysql:5.7
     ...
   frontend:
     build: frontend