diff --git a/Gemfile b/Gemfile
index 783d77b..f8390d9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 gem 'puma'
 gem 'rack-contrib'
 gem 'rack-ssl'
-gem "rack", "2.0.8"
+gem "rack", "2.1.4"
 gem 'rake'
 
 gem 'kramdown'
diff --git a/Gemfile.lock b/Gemfile.lock
index a89f469..8162879 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,7 @@ GEM
     public_suffix (4.0.3)
     puma (4.3.1)
       nio4r (~> 2.0)
-    rack (2.0.8)
+    rack (2.1.4)
     rack-contrib (2.1.0)
       rack (~> 2.0)
     rack-livereload (0.3.17)
@@ -141,7 +141,7 @@ DEPENDENCIES
   middleman-livereload (~> 3.4)
   percy-cli
   puma
-  rack (= 2.0.8)
+  rack (= 2.1.4)
   rack-contrib
   rack-ssl
   rake