diff --git a/mcp.gemspec b/mcp.gemspec
index ccbb63e..fefe3b3 100644
--- a/mcp.gemspec
+++ b/mcp.gemspec
@@ -28,5 +28,5 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency("json_rpc_handler", "~> 0.1")
-  spec.add_dependency("json-schema", "~> 4.1")
+  spec.add_dependency("json-schema", ">= 4.1")
 end