diff --git a/Gemfile b/Gemfile
index 12a1cdb..6237f98 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 group :development, :test do
   gem 'jekyll', '~> 3.8.5'
   gem 'jekyll-sitemap', '~> 1.2'
-  gem 'nokogiri', '1.8.5'
+  gem 'nokogiri', '1.11.0'
   gem 'tzinfo', '>=1.2.5'
   gem 'tzinfo-data', '>=1.0.0'
   gem 'wdm', '>= 0.1.1' if Gem.win_platform?
diff --git a/Gemfile.lock b/Gemfile.lock
index fd766f4..b16cc3e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,15 +43,17 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    mini_portile2 (2.3.0)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
-    nokogiri (1.8.5-x64-mingw32)
-      mini_portile2 (~> 2.3.0)
-    nokogiri (1.8.5-x86-mingw32)
-      mini_portile2 (~> 2.3.0)
+    mini_portile2 (2.5.1)
+    nokogiri (1.11.0)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
+    nokogiri (1.11.0-x64-mingw32)
+      racc (~> 1.4)
+    nokogiri (1.11.0-x86-mingw32)
+      racc (~> 1.4)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
+    racc (1.5.2)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
@@ -68,7 +70,6 @@ GEM
       thread_safe (~> 0.1)
     tzinfo-data (1.2018.5)
       tzinfo (>= 1.0.0)
-    wdm (0.1.1)
 
 PLATFORMS
   ruby
@@ -78,10 +79,9 @@ PLATFORMS
 DEPENDENCIES
   jekyll (~> 3.8.5)
   jekyll-sitemap (~> 1.2)
-  nokogiri (= 1.8.5)
+  nokogiri (= 1.11.0)
   tzinfo (>= 1.2.5)
   tzinfo-data (>= 1.0.0)
-  wdm (>= 0.1.1)
 
 BUNDLED WITH
    1.16.4