diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 5fe544c60cc51b58bebf649b0361c86b9ce45a95..a895d1ab186e5e74051c76f1fb2378f902714216 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -113,9 +113,7 @@ def closed?
     # The underlying body, as a streamable object.
     attr_reader :stream
 
-    # Ruby 2.2 bug https://bugs.ruby-lang.org/issues/10685 prevents
-    # default_headers from being a keyword argument.
-    def initialize(status = 200, header = {}, body = [], default_headers = self.class.default_headers)
+    def initialize(status = 200, header = {}, body = [], default_headers: self.class.default_headers)
       super()
 
       header = merge_default_headers(header, default_headers)
diff --git a/actionpack/lib/action_dispatch/testing/test_response.rb b/actionpack/lib/action_dispatch/testing/test_response.rb
index 527784885c1ea724ae251d285dc43d6576c4b25a..a9b88ac5fdfe95eb2f99fe041a81c3f8f78d59d5 100644
--- a/actionpack/lib/action_dispatch/testing/test_response.rb
+++ b/actionpack/lib/action_dispatch/testing/test_response.rb
@@ -7,7 +7,7 @@ module ActionDispatch
   # See Response for more information on controller response objects.
   class TestResponse < Response
     def self.from_response(response)
-      new response.status, response.headers, response.body, nil
+      new response.status, response.headers, response.body, default_headers: nil
     end
 
     # Was the response successful?
diff --git a/railties/lib/rails/ruby_version_check.rb b/railties/lib/rails/ruby_version_check.rb
index e2a199ec4d3a9adf44f0747b645aac5efe87a08f..9131c51e91d320ba704865a53bfd8ad657509a11 100644
--- a/railties/lib/rails/ruby_version_check.rb
+++ b/railties/lib/rails/ruby_version_check.rb
@@ -1,13 +1,13 @@
-if RUBY_VERSION < '2.2.0' && RUBY_ENGINE == 'ruby'
+if RUBY_VERSION < '2.2.1' && RUBY_ENGINE == 'ruby'
   desc = defined?(RUBY_DESCRIPTION) ? RUBY_DESCRIPTION : "ruby #{RUBY_VERSION} (#{RUBY_RELEASE_DATE})"
   abort <<-end_message
 
-    Rails 5 requires to run on Ruby 2.2.0 or newer.
+    Rails 5 requires to run on Ruby 2.2.1 or newer.
 
     You're running
       #{desc}
 
-    Please upgrade to Ruby 2.2.0 or newer to continue.
+    Please upgrade to Ruby 2.2.1 or newer to continue.
 
   end_message
 end