diff --git a/CHANGELOG.md b/CHANGELOG.md
index 58ea04d..3b4f0cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@
  * @Description: Update log
  -->
 
+# 3.1.1
+- change readme
+
 # 3.1.0
 - Use the way back to v2 version
 - Modify registration method
diff --git a/README.md b/README.md
index ecd5f8d..baf8088 100644
--- a/README.md
+++ b/README.md
@@ -13,11 +13,6 @@
 
 [Update log](https://github.com/OpenFlutter/flutter_screenutil/blob/master/CHANGELOG.md)
 
-## Note
-[v3](https://github.com/OpenFlutter/flutter_screenutil/tree/beta) requires `flutter >= 1.19.0`.
-
-[v2](https://github.com/OpenFlutter/flutter_screenutil) support all versions.
-
 ## Usage:
 
 ### Add dependency：
diff --git a/README_CN.md b/README_CN.md
index 6ba5923..ff5a625 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -17,11 +17,6 @@
 
 [更新日志](https://github.com/OpenFlutter/flutter_screenutil/blob/master/CHANGELOG.md)
 
-## Note
-[v3](https://github.com/OpenFlutter/flutter_screenutil/tree/beta)可用于`flutter >= 1.19.0`
-
-[v2](https://github.com/OpenFlutter/flutter_screenutil)可用于所有版本。
-
 ## 使用方法:
 
 ### 安装依赖：
diff --git a/README_PT.md b/README_PT.md
index 6c0f1fd..a1a248c 100644
--- a/README_PT.md
+++ b/README_PT.md
@@ -13,11 +13,6 @@
 
 [Histórico de atualizações](https://github.com/OpenFlutter/flutter_screenutil/blob/master/CHANGELOG.md)
 
-## Note
-[v3](https://github.com/OpenFlutter/flutter_screenutil/tree/beta) requer `flutter >= 1.19.0`.
-
-[v2](https://github.com/OpenFlutter/flutter_screenutil) support all versions.
-
 ## Como usar:
 
 ### Adicionando a dependência：
diff --git a/pubspec.yaml b/pubspec.yaml
index 8292636..923c063 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: flutter_screenutil
 description: A flutter plugin for adapting screen and font size.Guaranteed to look good on different models
-version: 3.1.0
+version: 3.1.1
 homepage: https://github.com/OpenFlutter/flutter_screenutil/tree/beta
 
 environment: