diff --git a/Gemfile b/Gemfile
index dcc84fa22..e6d22283f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -31,7 +31,7 @@ gem 'rails-settings-cached',     '0.4.1' # for settings
 
 # html-xml
 gem 'haml-rails', '0.9.0' # haml for views
-gem 'nokogiri',   '1.7.1' # For XML parsing
+gem 'nokogiri'  # For XML parsing
 
 # style
 gem 'sass-rails',     '5.0.3'   # sass style
diff --git a/Gemfile.lock b/Gemfile.lock
index d83f27393..9e6a22a40 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -396,7 +396,7 @@ GEM
       activesupport (>= 4.2.0.alpha)
     rails-dom-testing (1.0.8)
       activesupport (>= 4.2.0.beta, < 5.0)
-      nokogiri (~> 1.6)
+      nokogiri (~> 1.7)
       rails-deprecated_sanitizer (>= 1.0.1)
     rails-html-sanitizer (1.0.3)
       loofah (~> 2.0)
@@ -625,7 +625,7 @@ DEPENDENCIES
   liquid (= 3.0.6)
   mina (= 0.3.1)
   money-rails (= 1.4.1)
-  nokogiri (= 1.7.1)
+  nokogiri
   nprogress-rails (= 0.1.6.7)
   paper_trail!
   pdfkit (= 0.6.2)