diff --git a/dart/angular_tour_of_heroes/pubspec.yaml b/dart/angular_tour_of_heroes/pubspec.yaml
old mode 100755
new mode 100644
index 066dab4..cad0561
--- a/dart/angular_tour_of_heroes/pubspec.yaml
+++ b/dart/angular_tour_of_heroes/pubspec.yaml
@@ -6,15 +6,15 @@ environment:
   sdk: '>=2.2.0 <3.0.0'
 
 dependencies:
-  angular: ^6.0.0-alpha
-  angular_forms: ^2.1.0
-  angular_router: ^2.0.0-alpha
-  http: ^0.12.0
-  stream_transform: ^0.0.19
+  angular: ">=6.0.0-alpha <8.0.0"
+  angular_forms: ">=2.1.0 <5.0.0"
+  angular_router: ">=2.0.0-alpha <4.0.0"
+  http: ">=0.12.0 <0.14.0"
+  stream_transform: ">=0.0.19 <3.0.0"
 
 dev_dependencies:
-  angular_test: ^2.3.1
-  build_runner: ^1.5.1
-  build_test: ^0.10.8
-  build_web_compilers: ^2.1.0
+  angular_test: ">=2.3.1 <5.0.0"
+  build_runner: ">=1.5.1 <3.0.0"
+  build_test: ">=0.10.8 <3.0.0"
+  build_web_compilers: ">=2.1.0 <4.0.0"
   test: ^1.6.4
diff --git a/dart/quickstart-master/pubspec.yaml b/dart/quickstart-master/pubspec.yaml
old mode 100755
new mode 100644