diff --git a/Gemfile b/Gemfile
index 3385504..135f2ba 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 gem 'fastreader'
 gem 'nokogiri', '1.6.0', :git => 'https://github.com/sparklemotion/nokogiri.git'
-gem 'rack', '~> 1.1'
+gem 'rack', '~> 2.0', '>= 2.0.9.1'
 gem 'rspec', :git => 'https://github.com/rspec/rspec.git'
 gem 'pdfkit', '~> 0.5'
diff --git a/Gemfile.lock b/Gemfile.lock
index a7a8fd8..aafd2ab 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
     i18n (0.7.0)
     minitest (5.9.1)
     pdfkit (0.5.2)
-    rack (1.6.4)
+    rack (2.2.3.1)
     rake (11.3.0)
     rspec-core (3.6.0.beta1)
       rspec-support (= 3.6.0.beta1)
@@ -75,8 +75,8 @@ DEPENDENCIES
   fastreader
   nokogiri (= 1.6.0)!
   pdfkit (~> 0.5)
-  rack (~> 1.1)
+  rack (~> 2.0, >= 2.0.9.1)
   rspec!
 
 BUNDLED WITH
-   1.13.6
+   1.17.3