diff --git a/Gemfile b/Gemfile
index 03ad0c25..16e8ab21 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,5 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in cfa-styleguide.gemspec
 gemspec
+
+gem "rack", ">= 2.0.8"
diff --git a/Gemfile.lock b/Gemfile.lock
index b4583069..fc59b5c2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -150,7 +150,7 @@ GEM
       byebug (~> 10.0)
       pry (~> 0.10)
     public_suffix (3.0.3)
-    rack (2.0.6)
+    rack (2.1.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.2.1)
@@ -263,6 +263,7 @@ DEPENDENCIES
   github_changelog_generator
   percy-capybara (~> 4.0.0.pre.beta2)
   pry-byebug
+  rack (>= 2.0.8)
   rails (>= 3.1)
   rake (~> 10.0)
   rspec