diff --git a/Gemfile b/Gemfile
index 8af6595..6d198f7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'middleman-autoprefixer', '~> 2.7.0'
 gem 'middleman-sprockets', '~> 4.1.0'
 gem 'rouge', '~> 2.0.5'
 gem 'redcarpet', '~> 3.4.0'
-gem 'nokogiri', '~> 1.8.5'
+gem 'nokogiri', '~> 1.13.9'
 
 # Javascript Runtime
 gem 'therubyracer', '~> 0.12.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index 05a2287..92c0b8a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -80,10 +80,11 @@ GEM
     middleman-syntax (3.0.0)
       middleman-core (>= 3.2)
       rouge (~> 2.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.8.0)
     minitest (5.10.1)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.13.9)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     padrino-helpers (0.13.3.3)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.3)
@@ -92,6 +93,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.10.0)
     public_suffix (2.0.5)
+    racc (1.6.0)
     rack (2.0.5)
     rb-fsevent (0.9.8)
     rb-inotify (0.9.8)
@@ -123,7 +125,7 @@ DEPENDENCIES
   middleman-autoprefixer (~> 2.7.0)
   middleman-sprockets (~> 4.1.0)
   middleman-syntax (~> 3.0.0)
-  nokogiri (~> 1.8.5)
+  nokogiri (~> 1.13.9)
   redcarpet (~> 3.4.0)
   rouge (~> 2.0.5)
   therubyracer (~> 0.12.3)