diff --git a/Gemfile b/Gemfile
index 57b9c53..a029983 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'middleman-autoprefixer', '~> 2.7.0'
 gem 'middleman-sprockets', '~> 4.1.0'
 gem 'rouge', '~> 2.0.5'
 gem 'redcarpet', '~> 3.4.0'
-gem 'nokogiri', '~> 1.10.8'
+gem 'nokogiri', '~> 1.13.4'
 gem 'haml', '~> 5.0.0'
 gem 'rack', '~> 2.0.8'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index d9331da..2937d21 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -24,6 +24,7 @@ GEM
     execjs (2.7.0)
     fast_blank (1.0.0)
     fastimage (2.1.7)
+    ffi (1.12.2)
     ffi (1.12.2-x64-mingw32)
     haml (5.0.4)
       temple (>= 0.8.0)
@@ -79,10 +80,13 @@ GEM
     middleman-syntax (3.0.0)
       middleman-core (>= 3.2)
       rouge (~> 2.0)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.8.0)
     minitest (5.14.0)
-    nokogiri (1.10.9-x64-mingw32)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.13.4)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
+    nokogiri (1.13.4-x64-mingw32)
+      racc (~> 1.4)
     padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.4)
@@ -91,6 +95,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.19.1)
     public_suffix (4.0.5)
+    racc (1.6.0)
     rack (2.0.9)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
@@ -112,6 +117,7 @@ GEM
       execjs (>= 0.3.0, < 3)
 
 PLATFORMS
+  ruby
   x64-mingw32
 
 DEPENDENCIES
@@ -120,7 +126,7 @@ DEPENDENCIES
   middleman-autoprefixer (~> 2.7.0)
   middleman-sprockets (~> 4.1.0)
   middleman-syntax (~> 3.0.0)
-  nokogiri (~> 1.10.8)
+  nokogiri (~> 1.13.4)
   rack (~> 2.0.8)
   redcarpet (~> 3.4.0)
   rouge (~> 2.0.5)