diff --git a/pubspec.yaml b/pubspec.yaml
index 99fbd47..f15da7a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -18,23 +18,23 @@ dependencies:
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^0.1.2
-  dio: ^2.0.2
-  json_serializable: ^2.0.0
-  cached_network_image: ^1.1.3
-  shared_preferences: ^0.5.1+1
-  flutter_spinkit: ^3.1.0
-  fluttertoast: ^3.0.1
-  flutter_webview_plugin: ^0.3.0+2
-  flutter_html: ^0.9.4
-  url_launcher: ^5.0.2
-  video_player: ^0.10.0+4
-  image_picker: ^0.5.1
+  cupertino_icons: ">=0.1.2 <2.0.0"
+  dio: ">=2.0.2 <6.0.0"
+  json_serializable: ">=2.0.0 <7.0.0"
+  cached_network_image: ">=1.1.3 <4.0.0"
+  shared_preferences: ">=0.5.1+1 <3.0.0"
+  flutter_spinkit: ">=3.1.0 <6.0.0"
+  fluttertoast: ">=3.0.1 <9.0.0"
+  flutter_webview_plugin: ">=0.3.0+2 <0.5.0"
+  flutter_html: ">=0.9.4 <3.0.0"
+  url_launcher: ">=5.0.2 <7.0.0"
+  video_player: ">=0.10.0+4 <3.0.0"
+  image_picker: ">=0.5.1 <0.9.0"
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  build_runner: ^1.1.2
+  build_runner: ">=1.1.2 <3.0.0"
 
 
 # For information on the generic Dart part of this file, see the