diff --git a/Gemfile b/Gemfile
index 1aa04ad..6de0ab6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -48,7 +48,7 @@ gem 'kramdown'
 gem 'liquid'
 gem 'listen'
 gem 'mercenary'
-gem 'rack', '~> 2.0.8'
+gem 'rack', '~> 2.1.4'
 gem 'railties', '>= 5.2.2.1'
 gem 'rouge'
 gem 'rubocop'
diff --git a/Gemfile.lock b/Gemfile.lock
index bfffedd..45ac5a0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -199,7 +199,7 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.5)
-    rack (2.0.9)
+    rack (2.1.4)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails-dom-testing (2.0.3)
@@ -300,7 +300,7 @@ DEPENDENCIES
   mini_racer
   minima
   nokogiri (>= 1.10.4)
-  rack (~> 2.0.8)
+  rack (~> 2.1.4)
   railties (>= 5.2.2.1)
   rouge
   rubocop