diff --git a/CHANGELOG.md b/CHANGELOG.md
index 94493aa2..7107ccfb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 ## 2.7.0
 
-* Added decoding/parsing of `grpc-status-details-bin` to pass all response exception details to the `GrpcError` thrown in Dart, via [#349](https://github.com/grpc/grpc-dart/pull/349).
+* Added decoding/parsing of `grpc-status-details-bin` to pass all response
+  exception details to the `GrpcError` thrown in Dart, via
+  [#349](https://github.com/grpc/grpc-dart/pull/349).
+* Dart SDK constraint is bumped to `>=2.3.0 <3.0.0` due to language version
+  in the generated protobuf code.
 
 ## 2.6.0
 
diff --git a/pubspec.yaml b/pubspec.yaml
index c30df9c7..d6c6fb67 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -3,15 +3,15 @@ description: Dart implementation of gRPC, a high performance, open-source univer
 
 version: 2.7.0
 
-author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/grpc-dart
 
 environment:
-  sdk: ">=2.2.0 <3.0.0"
+  sdk: '>=2.3.0 <3.0.0'
 
 dependencies:
   async: ^2.2.0
   crypto: ^2.1.4
+  fixnum: ^0.10.11
   googleapis_auth: ^0.2.7
   meta: ^1.1.6
   http: ^0.12.0