diff --git a/Gemfile b/Gemfile
index 7b67e6df..393d3919 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,6 +11,6 @@ group :development, :test do
   gem 'rspec', '~> 3.7.0'
   gem 'sqlite3', '>= 1.2.4'
   gem 'activerecord', '>= 4.0'
-  gem 'rack', '< 2.0.0'
+  gem 'rack', '< 3.0.0'
   gem 'equivalent-xml', '>= 0.6.0'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 9e1606fd..60306ecb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -67,7 +67,7 @@ GEM
     psych (3.1.0)
     public_suffix (4.0.6)
     racc (1.5.2)
-    rack (1.6.13)
+    rack (2.1.4.2)
     rake (0.9.6)
     rchardet (1.8.0)
     rdoc (6.3.2)
@@ -102,7 +102,7 @@ DEPENDENCIES
   juwelier
   minitest
   nokogiri (>= 1.3.3)
-  rack (< 2.0.0)
+  rack (< 3.0.0)
   rake (~> 0.9)
   rexml
   rspec (~> 3.7.0)