diff --git a/packages/mcp_dart_cli/pubspec.yaml b/packages/mcp_dart_cli/pubspec.yaml
index c39ed86c..a3cae85a 100644
--- a/packages/mcp_dart_cli/pubspec.yaml
+++ b/packages/mcp_dart_cli/pubspec.yaml
@@ -23,7 +23,7 @@ environment:
 
 dependencies:
   args: ^2.4.2
-  build: ^4.0.3
+  build: ">=4.0.3 <6.0.0"
   mason: ^0.1.2
   mason_logger: ^0.3.3
   mcp_dart: ^2.4.2