diff --git a/packages/smithy/smithy_codegen/pubspec.yaml b/packages/smithy/smithy_codegen/pubspec.yaml
index c0c4bb702d..00fa0616bf 100644
--- a/packages/smithy/smithy_codegen/pubspec.yaml
+++ b/packages/smithy/smithy_codegen/pubspec.yaml
@@ -19,7 +19,7 @@ dependencies:
   crclib: ^3.0.0
   dart_style: ^2.3.2
   fixnum: ^1.0.0
-  grpc: ^3.0.2
+  grpc: ^4.0.0
   html2md: ^1.2.5
   jmespath: ^2.0.0
   json_annotation: ">=4.9.0 <4.10.0"