diff --git a/Gemfile b/Gemfile
index f968fecc4..dd6408e59 100644
--- a/Gemfile
+++ b/Gemfile
@@ -25,7 +25,7 @@ gem 'validates_email_format_of', '1.8.2' # validates email against RFC 2822 and
 
 # 0.7.3 is the latest for Rails 4.2, however, it is absent on Rubygems server
 # https://github.com/huacnlee/rails-settings-cached/issues/165
-gem 'nokogiri', '~> 1.16.0'
+gem 'nokogiri', '~> 1.18.0'
 
 # style
 gem 'bootstrap-sass', '~> 3.4'