diff --git a/Gemfile b/Gemfile
index fca6188..cc92b1e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,5 +9,5 @@ gem 'middleman-sprockets', '~> 4.1'
 gem "middleman-livereload", "~> 3.4.3"
 gem 'rouge', '~> 3.20'
 gem 'redcarpet', '~> 3.5.0'
-gem 'nokogiri', '~> 1.10.8'
+gem 'nokogiri', '~> 1.13.9'
 gem 'sass'
diff --git a/Gemfile.lock b/Gemfile.lock
index 56af99e..a0eeb32 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.2.4.3)
+    activesupport (5.2.8.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -36,7 +36,7 @@ GEM
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    kramdown (2.3.0)
+    kramdown (2.4.0)
       rexml
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -76,7 +76,7 @@ GEM
       servolux
       tilt (~> 2.0.9)
       uglifier (~> 3.0)
-    middleman-livereload (3.4.6)
+    middleman-livereload (3.4.7)
       em-websocket (~> 0.5.1)
       middleman-core (>= 3.3)
       rack-livereload (~> 0.3.15)
@@ -86,10 +86,11 @@ GEM
     middleman-syntax (3.2.0)
       middleman-core (>= 3.2)
       rouge (~> 3.2)
-    mini_portile2 (2.4.0)
-    minitest (5.14.1)
-    nokogiri (1.10.9)
-      mini_portile2 (~> 2.4.0)
+    mini_portile2 (2.8.0)
+    minitest (5.16.3)
+    nokogiri (1.13.9)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.4)
@@ -98,15 +99,16 @@ GEM
       activesupport (>= 3.1)
     parallel (1.19.2)
     public_suffix (4.0.5)
+    racc (1.6.0)
     rack (2.2.3)
     rack-livereload (0.3.17)
       rack
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    redcarpet (3.5.0)
+    redcarpet (3.5.1)
     rexml (3.2.4)
-    rouge (3.20.0)
+    rouge (3.30.0)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
@@ -122,7 +124,7 @@ GEM
     thor (1.0.1)
     thread_safe (0.3.6)
     tilt (2.0.10)
-    tzinfo (1.2.7)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
@@ -136,7 +138,7 @@ DEPENDENCIES
   middleman-livereload (~> 3.4.3)
   middleman-sprockets (~> 4.1)
   middleman-syntax (~> 3.2)
-  nokogiri (~> 1.10.8)
+  nokogiri (~> 1.13.9)
   redcarpet (~> 3.5.0)
   rouge (~> 3.20)
   sass