diff --git a/README.md b/README.md
index a085997..b489b9a 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ This is a comprehensive but a concise and educational e-book aiming at advertisi
 
 To appear Sep. the first of 2021
 
-#### Outline (Current Release V0.4)
+#### Outline (Current Release V0.5)
 
 view [actual outline](https://github.com/Mathemodica/ModelicaPowerSystemBook/blob/main/ModelicaPowerSys-outline.pdf)