diff --git a/Gemfile b/Gemfile
index 3c7da75d..b19b52f7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -221,14 +221,10 @@ gem 'selectize-rails'
 # For collecting performance data
 gem 'skylight'
 
-# Nokogiri < 1.8.1 is subject to:
-# CVE-2017-0663, CVE-2017-7375, CVE-2017-7376, CVE-2017-9047, CVE-2017-9048,
-# CVE-2017-9049, CVE-2017-9050
-gem 'nokogiri', '>= 1.8.1'
-
 # memcached binary connector
 gem 'dalli'
 
+# to generate ical files
 gem 'icalendar'
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 2fb68c07..5cb15e25 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -683,7 +683,6 @@ DEPENDENCIES
   money-rails
   mysql2
   next_rails
-  nokogiri (>= 1.8.1)
   omniauth
   omniauth-facebook
   omniauth-github