strong_json.gemspec in strong_json-2.1.0 vs strong_json.gemspec in strong_json-2.1.1

- old
+ new

@@ -20,7 +20,7 @@
   spec.metadata = { "steep_types" => "sig" }
 
   spec.add_development_dependency "bundler", ">= 1.6"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"
-  spec.add_development_dependency "steep", "~> 0.10"
+  spec.add_development_dependency "steep", "~> 0.15"
 end