diff --git a/Gemfile b/Gemfile
index f977c1f..801a4bb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,7 +13,7 @@ group :development do
   gem 'rb-fsevent', '~> 0.9'
   gem 'stringex', '~> 1.4.0'
   gem 'liquid', '~> 2.3.0'
-  gem 'nokogiri', '~> 1.5.0'
+  gem 'nokogiri', '~> 1.11.4'
 end
 
 gem 'sinatra', '~> 1.3.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index c022730..a7832d3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,10 +28,14 @@ GEM
     liquid (2.3.0)
     maruku (0.6.0)
       syntax (>= 1.0.0)
-    nokogiri (1.5.4)
+    mini_portile2 (2.5.1)
+    nokogiri (1.11.4)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
     posix-spawn (0.3.6)
     pygments.rb (0.2.12)
       rubypython (~> 0.5.3)
+    racc (1.5.2)
     rack (1.4.1)
     rack-protection (1.2.0)
       rack
@@ -60,7 +64,7 @@ DEPENDENCIES
   haml (~> 3.1.6)
   jekyll (~> 0.11.2)
   liquid (~> 2.3.0)
-  nokogiri (~> 1.5.0)
+  nokogiri (~> 1.11.4)
   pygments.rb (~> 0.2.12)
   rack (~> 1.4.1)
   rake (~> 0.9.2)