diff --git a/Gemfile b/Gemfile
index 455fd3c..2d79d50 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'font-awesome-sass', '~> 4.4.0'
 gem 'jquery-middleman', '~> 3.1.2'
 gem 'json', '~> 2.3.0'
 gem 'nokogiri', '~> 1.13.6'
-gem 'rack', '~> 2.1.4'
+gem 'rack', '~> 2.2.6'
 
 gem 'wdm', '~> 0.1.1', platforms: [:mswin, :mingw]
 gem 'tzinfo-data', '~> 1.2018.9', platforms: [:mswin, :mingw, :jruby]
diff --git a/Gemfile.lock b/Gemfile.lock
index 40cf366..d792887 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -124,7 +124,7 @@ GEM
     public_suffix (4.0.6)
     racc (1.6.0)
     racc (1.6.0-java)
-    rack (2.1.4.1)
+    rack (2.2.6.4)
     rack-livereload (0.3.17)
       rack
     rb-fsevent (0.10.4)
@@ -174,7 +174,7 @@ DEPENDENCIES
   middleman-search_engine_sitemap (~> 1.4.0)
   middleman-sprockets (~> 4.1.1)
   nokogiri (~> 1.13.6)
-  rack (~> 2.1.4)
+  rack (~> 2.2.6)
   tzinfo-data (~> 1.2018.9)
   wdm (~> 0.1.1)