diff --git a/mcp.gemspec b/mcp.gemspec
index 5c49985..3ba36df 100644
--- a/mcp.gemspec
+++ b/mcp.gemspec
@@ -28,8 +28,8 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency("json_rpc_handler", "~> 0.1")
-  spec.add_dependency("rack", ">= 2.0.0")
   spec.add_development_dependency("activesupport")
   spec.add_development_dependency("puma", ">= 5.0.0")
+  spec.add_development_dependency("rack", ">= 2.0.0")
   spec.add_development_dependency("sorbet-static-and-runtime")
 end