diff --git a/README_zh.md b/README_zh.md
index b625267b..7024ce03 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -70,7 +70,7 @@ class MyView: MacawView {
 
 ## 系统要求
 
-* iOS 8.0+
+* iOS 9.0+
 * Mac OS X 10.11+
 * Xcode 7.3+