diff --git a/README.md b/README.md
index f27a1ed6..701e28c3 100644
--- a/README.md
+++ b/README.md
@@ -87,7 +87,7 @@ We're working hard to provide full documentation. Currently you can take a look
 
 ## Requirements
 
-* iOS 8.0+
+* iOS 9.0+
 * Mac OS X 10.11+
 * Xcode 7.3+
 
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+