diff --git a/.drone.yml b/.drone.yml
index 77c8674..1061906 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -3,7 +3,7 @@ name: default
 
 steps:
 - name: prepare
-  image: v7lin/flutter:1.7.8-hotfix.3-stable
+  image: v7lin/flutter:1.9.1-hotfix.2-stable
   volumes:
   - name: pub-cache
     path: /opt/flutter/.pub-cache
@@ -11,7 +11,7 @@ steps:
   - flutter packages get
 
 #- name: build_runner
-#  image: v7lin/flutter:1.7.8-hotfix.3-stable
+#  image: v7lin/flutter:1.9.1-hotfix.2-stable
 #  volumes:
 #  - name: pub-cache
 #    path: /opt/flutter/.pub-cache
@@ -19,7 +19,7 @@ steps:
 #  - flutter packages pub run build_runner build
 
 - name: format
-  image: v7lin/flutter:1.7.8-hotfix.3-stable
+  image: v7lin/flutter:1.9.1-hotfix.2-stable
   volumes:
   - name: pub-cache
     path: /opt/flutter/.pub-cache
@@ -27,7 +27,7 @@ steps:
   - flutter format --dry-run --set-exit-if-changed .
 
 - name: analyze
-  image: v7lin/flutter:1.7.8-hotfix.3-stable
+  image: v7lin/flutter:1.9.1-hotfix.2-stable
   volumes:
   - name: pub-cache
     path: /opt/flutter/.pub-cache
@@ -35,7 +35,7 @@ steps:
   - flutter analyze
 
 - name: test
-  image: v7lin/flutter:1.7.8-hotfix.3-stable
+  image: v7lin/flutter:1.9.1-hotfix.2-stable
   volumes:
   - name: pub-cache
     path: /opt/flutter/.pub-cache
@@ -45,7 +45,7 @@ steps:
   - flutter test
 
 - name: proguard
-  image: v7lin/flutter:1.7.8-hotfix.3-stable
+  image: v7lin/flutter:1.9.1-hotfix.2-stable
   volumes:
   - name: pub-cache
     path: /opt/flutter/.pub-cache
@@ -68,7 +68,7 @@ steps:
       - pull_request
 
 - name: publish-check
-  image: v7lin/flutter:1.7.8-hotfix.3-stable
+  image: v7lin/flutter:1.9.1-hotfix.2-stable
   volumes:
   - name: pub-cache
     path: /opt/flutter/.pub-cache
@@ -112,7 +112,7 @@ steps:
   - rm $PUB_CACHE/credentials.json.enc
 
 - name: publish
-  image: v7lin/flutter:1.7.8-hotfix.3-stable
+  image: v7lin/flutter:1.9.1-hotfix.2-stable
   volumes:
   - name: pub-cache
     path: /opt/flutter/.pub-cache
diff --git a/CHANGELOG.md b/CHANGELOG.md
index be81da4..dff1ebc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.2.4 - 2019.9.26
+
+* 降级Android SDK
+* 升级iOS SDK
+
 ## 0.2.3 - 2019.8.1
 
 * 升级Android SDK
diff --git a/README.md b/README.md
index 8395154..109fb0e 100644
--- a/README.md
+++ b/README.md
@@ -30,21 +30,25 @@ flutter版新浪微博SDK
 
 ## android
 
-````
+```
 # 不需要做任何额外接入工作
 # 混淆已打入 Library，随 Library 引用，自动添加到 apk 打包混淆
-````
+```
 
 ## ios
 
-````
+```
+iOS 9.0
+```
+
+```
 在Xcode中，选择你的工程设置项，选中“TARGETS”一栏，在“info”标签栏的“URL type“添加“URL scheme”为你所注册的应用程序id
 
 URL Types
 weibosdk: identifier=com.weibo schemes=wb${appKey}
-````
+```
 
-````
+```
 iOS 9系统策略更新，限制了http协议的访问，此外应用需要在“Info.plist”中将要使用的URL Schemes列为白名单，才可正常检查其他应用是否安装。
 <key>LSApplicationQueriesSchemes</key>
 <array>
@@ -72,24 +76,24 @@ iOS 9系统策略更新，限制了http协议的访问，此外应用需要在
         </dict>
     </dict>
 </dict>
-````
+```
 ## flutter
 
 * snapshot
 
-````
+```
 dependencies:
   fake_weibo:
     git:
       url: https://github.com/v7lin/fake_weibo.git
-````
+```
 
 * release
 
-````
+```
 dependencies:
   fake_weibo: ^${latestTag}
-````
+```
 
 * example
 
diff --git a/android/build.gradle b/android/build.gradle
index 684e428..61cb689 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -44,5 +44,5 @@ android {
 }
 
 dependencies {
-    implementation 'com.sina.weibo.sdk:core:4.4.2:openDefaultRelease@aar'
+    implementation 'com.sina.weibo.sdk:core:4.3.4:openDefaultRelease@aar'
 }
diff --git a/example/ios/Runner.xcodeproj/project.pbxproj b/example/ios/Runner.xcodeproj/project.pbxproj
index f740e55..3b6809e 100644
--- a/example/ios/Runner.xcodeproj/project.pbxproj
+++ b/example/ios/Runner.xcodeproj/project.pbxproj
@@ -194,6 +194,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 				Base,
 			);
@@ -401,6 +402,7 @@
 					"$(PROJECT_DIR)/Flutter",
 				);
 				INFOPLIST_FILE = Runner/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				LIBRARY_SEARCH_PATHS = (
 					"$(inherited)",
@@ -527,6 +529,7 @@
 					"$(PROJECT_DIR)/Flutter",
 				);
 				INFOPLIST_FILE = Runner/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				LIBRARY_SEARCH_PATHS = (
 					"$(inherited)",
@@ -551,6 +554,7 @@
 					"$(PROJECT_DIR)/Flutter",
 				);
 				INFOPLIST_FILE = Runner/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				LIBRARY_SEARCH_PATHS = (
 					"$(inherited)",
diff --git a/ios/fake_weibo.podspec b/ios/fake_weibo.podspec
index 311dd1b..fdf6d61 100644
--- a/ios/fake_weibo.podspec
+++ b/ios/fake_weibo.podspec
@@ -17,8 +17,8 @@ A new Flutter plugin.
   s.dependency 'Flutter'
   # 微博
   s.static_framework = true
-  s.dependency 'Weibo_SDK', '~> 3.2.3'
+  s.dependency 'Weibo_SDK', '~> 3.2.5.1'
 
-  s.ios.deployment_target = '8.0'
+  s.ios.deployment_target = '9.0'
 end
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 8a80fae..3bcac81 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: fake_weibo
 description: A powerful weibo plugin for Flutter.
-version: 0.2.3
+version: 0.2.4
 author: v7lin <v7lin@qq.com>
 homepage: https://github.com/v7lin/fake_weibo