diff --git a/README.md b/README.md
index 2ca91d4..dae81a0 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Add security related headers to HTTP response. The package includes Service Prov
 
 ## Version
 
-3.1.0
+4.0.0
 
 ## Document