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Now we can update Nokogiri to 1.8.0 because Ruby 2.1 support has been dropped by #25538 and #23630.

Quotation from CHANGELOG of Nokogiri 1.8.0 :

This release ends support for Ruby 2.1 on Windows in the x86-mingw32 and x64-mingw32 platform gems (containing pre-compiled DLLs). Official support ended for Ruby 2.1 on 2017-04-01.

Index: Gemfile
===================================================================
--- Gemfile    (revision 16868)
+++ Gemfile    (working copy)
@@ -13,7 +13,7 @@
 gem "roadie", "~> 3.2.1" 
 gem "mimemagic" 

-gem "nokogiri", "~> 1.7.2" 
+gem "nokogiri", "~> 1.8.0" 
 gem "i18n", "~> 0.7.0" 

 # Request at least rails-html-sanitizer 1.0.3 because of security advisories