diff --git a/Gemfile b/Gemfile
index 7e433735d5..ece1344ea1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -111,7 +111,7 @@ gem 'httparty', '~> 0.22.0'
 gem 'slack-notifier', '~> 2.4.0'
 
 # css styles for emails
-gem 'nokogiri', '~> 1.16.5'
+gem 'nokogiri', '~> 1.16.6'
 gem 'premailer-rails', '~> 1.12.0'
 
 # filtering
diff --git a/Gemfile.lock b/Gemfile.lock
index ed08d48557..97fd65087c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -313,7 +313,7 @@ GEM
       net-protocol
     net-ssh (7.1.0)
     nio4r (2.7.3)
-    nokogiri (1.16.5-x86_64-linux)
+    nokogiri (1.16.6-x86_64-linux)
       racc (~> 1.4)
     oauth2 (2.0.9)
       faraday (>= 0.17.3, < 3.0)
@@ -615,7 +615,7 @@ DEPENDENCIES
   minitest-utils (~> 0.4.8)
   mocha (~> 2.3.0)
   mysql2 (~> 0.5.6)
-  nokogiri (~> 1.16.5)
+  nokogiri (~> 1.16.6)
   omniauth-google-oauth2 (~> 1.1.2)
   omniauth-oauth2 (~> 1.8.0)
   omniauth-rails_csrf_protection (~> 1.0.2)