fernet.gemspec in legacy-fernet-1.6.3 vs fernet.gemspec in legacy-fernet-1.6.4

@@ -13,10 +13,7 @@
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.name          = "legacy-fernet"
   gem.require_paths = ["lib"]
   gem.version       = Fernet::Legacy::VERSION
 
-  gem.add_dependency "multi_json"
-
-  gem.add_development_dependency "rspec"
-  gem.add_development_dependency "oj"
+  gem.add_dependency "multi_json", "~> 1.0"
 end