diff --git a/Gemfile b/Gemfile
index 95029e3..734ce8b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,5 +8,5 @@ gem 'middleman-autoprefixer', '~> 2.7'
 gem 'middleman-sprockets', '~> 4.1'
 gem 'rouge', '~> 3.2'
 gem 'redcarpet', '~> 3.4.0'
-gem 'nokogiri', '~> 1.10.8'
+gem 'nokogiri', '~> 1.13.9'
 gem 'sass'
diff --git a/Gemfile.lock b/Gemfile.lock
index fa11fe9..788da7d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,8 +22,8 @@ GEM
     execjs (2.7.0)
     fast_blank (1.0.0)
     fastimage (2.1.7)
-    ffi (1.12.2)
-    ffi (1.12.2-x64-mingw32)
+    ffi (1.15.5)
+    ffi (1.15.5-x64-mingw32)
     haml (5.1.2)
       temple (>= 0.8.0)
       tilt
@@ -74,15 +74,14 @@ GEM
     middleman-sprockets (4.1.1)
       middleman-core (~> 4.0)
       sprockets (>= 3.0)
-    middleman-syntax (3.2.0)
+    middleman-syntax (3.3.0)
       middleman-core (>= 3.2)
       rouge (~> 3.2)
-    mini_portile2 (2.4.0)
-    minitest (5.14.0)
-    nokogiri (1.10.9)
-      mini_portile2 (~> 2.4.0)
-    nokogiri (1.10.9-x64-mingw32)
-      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)
@@ -91,30 +90,31 @@ GEM
       activesupport (>= 3.1)
     parallel (1.19.1)
     public_suffix (4.0.3)
-    rack (2.2.2)
+    racc (1.6.0)
+    rack (2.2.4)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redcarpet (3.4.0)
-    rouge (3.17.0)
+    rouge (3.30.0)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sassc (2.3.0)
+    sassc (2.4.0)
       ffi (~> 1.9)
-    sassc (2.3.0-x64-mingw32)
+    sassc (2.4.0-x64-mingw32)
       ffi (~> 1.9)
     servolux (0.13.0)
-    sprockets (3.7.2)
+    sprockets (4.1.1)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     temple (0.8.2)
     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)
@@ -128,7 +128,7 @@ DEPENDENCIES
   middleman-autoprefixer (~> 2.7)
   middleman-sprockets (~> 4.1)
   middleman-syntax (~> 3.2)
-  nokogiri (~> 1.10.8)
+  nokogiri (~> 1.13.9)
   redcarpet (~> 3.4.0)
   rouge (~> 3.2)
   sass