diff --git a/split.gemspec b/split.gemspec
index 626d5586..3e3b49ae 100644
--- a/split.gemspec
+++ b/split.gemspec
@@ -36,7 +36,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'bundler',     '>= 1.17'
   s.add_development_dependency 'simplecov',   '~> 0.15'
-  s.add_development_dependency 'rack-test',   '~> 1.1'
+  s.add_development_dependency 'rack-test',   '~> 2.0'
   s.add_development_dependency 'rake',        '~> 13'
   s.add_development_dependency 'rspec',       '~> 3.7'
   s.add_development_dependency 'pry',         '~> 0.10'