diff --git a/android/app/proguard-rules.pro b/android/app/proguard-rules.pro
index fe49ab4..5660f35 100644
--- a/android/app/proguard-rules.pro
+++ b/android/app/proguard-rules.pro
@@ -37,9 +37,9 @@
      public<init>(org.json.JSONObject);
 }
 -keepclassmembers enum *{
-      publicstatic**[] values();
-      publicstatic** valueOf(java.lang.String);
+      public static **[] values();
+      public static ** valueOf(java.lang.String);
 }
 -keep public class com.kouyuxingqiu.wow_english.R$*{
-      publicstaticfinalint*;
+      public static final int *;
 }
\ No newline at end of file
diff --git a/pubspec.yaml b/pubspec.yaml
index 948bf41..feead5e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -19,7 +19,8 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.4+4
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: '>=3.2.0 <4.0.0'
+  flutter: '>=3.16.0'
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions