diff --git a/example/grpc-web/pubspec.yaml b/example/grpc-web/pubspec.yaml
index e215c13..11d1725 100644
--- a/example/grpc-web/pubspec.yaml
+++ b/example/grpc-web/pubspec.yaml
@@ -3,7 +3,7 @@ description: Dart gRPC-Web sample client
 publish_to: none
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: ^3.5.0
 
 dependencies:
   grpc:
@@ -11,6 +11,6 @@ dependencies:
   protobuf: ^3.0.0
 
 dev_dependencies:
-  build_runner: ^2.0.0
-  build_web_compilers: '>3.0.0 <5.0.0'
-  lints: ^2.0.0
+  build_runner: ^2.4.13
+  build_web_compilers: ^4.0.11
+  lints: ^5.1.0