diff --git a/.idea/libraries/Flutter_Plugins.xml b/.idea/libraries/Flutter_Plugins.xml
index b0f6971..53449da 100644
--- a/.idea/libraries/Flutter_Plugins.xml
+++ b/.idea/libraries/Flutter_Plugins.xml
@@ -1,6 +1,8 @@
 <component name="libraryTable">
   <library name="Flutter Plugins" type="FlutterPluginsLibraryType">
-    <CLASSES />
+    <CLASSES>
+      <root url="file://$PROJECT_DIR$" />
+    </CLASSES>
     <JAVADOC />
     <SOURCES />
   </library>
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index dbb300d..cd8dc4e 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -4,7 +4,7 @@ version: 0.0.1
 publish_to: 'none'
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.12.0 <4.0.0"
 
 dependencies:
   integration_test:
diff --git a/pubspec.yaml b/pubspec.yaml
index f958d77..0a93e5b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -7,7 +7,7 @@ issue_tracker: https://github.com/lcuis/search_choices/issues
 
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.12.0 <4.0.0"
   flutter: ">=1.12.0"
 
 dependencies:
diff --git a/search_choices.iml b/search_choices.iml
index b92005a..80d5bf7 100644
--- a/search_choices.iml
+++ b/search_choices.iml
@@ -22,6 +22,5 @@
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="Dart SDK" level="project" />
     <orderEntry type="library" name="Flutter Plugins" level="project" />
-    <orderEntry type="library" name="Dart Packages" level="project" />
   </component>
 </module>
\ No newline at end of file