diff --git a/Gemfile b/Gemfile
index 16eaf76..23fb18e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'middleman-autoprefixer', '~> 3.0.0'
 gem 'middleman-sprockets', '~> 4.1.1'
 gem 'middleman-syntax', '~> 3.2.0'
 gem 'nokogiri', '~> 1.18.8'
-gem 'rack', '~> 2.2.13'
+gem 'rack', '~> 2.2.20'
 gem 'redcarpet', '~> 3.6.0'
 gem 'rouge', '~> 3.30.0'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index acb5e9a..0bbbaca 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -93,7 +93,7 @@ GEM
     parslet (2.0.0)
     public_suffix (5.0.3)
     racc (1.8.1)
-    rack (2.2.13)
+    rack (2.2.20)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -128,7 +128,7 @@ DEPENDENCIES
   middleman-sprockets (~> 4.1.1)
   middleman-syntax (~> 3.2.0)
   nokogiri (~> 1.18.8)
-  rack (~> 2.2.13)
+  rack (~> 2.2.20)
   redcarpet (~> 3.6.0)
   rouge (~> 3.30.0)