diff --git a/Gemfile b/Gemfile
index ffb5837..9b3c260 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,15 +17,7 @@ group :development do
   # bad, pin to a specific version number here. Try to keep this relatively
   # up-to-date, but it's not the end of the world if it's not.
   gem "rubocop", "0.50.0"
-
-  # Rack 2.0+ requires Ruby >= 2.2.2 which is problematic for the test suite on
-  # older Ruby versions. Check Ruby the version here and put a maximum
-  # constraint on Rack if necessary.
-  if RUBY_VERSION >= "2.2.2"
-    gem "rack", ">= 2.0.8"
-  else
-    gem "rack", ">= 1.5", "< 2.0" # rubocop:disable Bundler/DuplicatedGem
-  end
+  gem "rack", ">= 2.0.8"
 
   platforms :mri do
     # to avoid problems, bring Byebug in on just versions of Ruby under which
diff --git a/helio-ruby.gemspec b/helio-ruby.gemspec
index aa99588..7afaf34 100644
--- a/helio-ruby.gemspec
+++ b/helio-ruby.gemspec
@@ -5,7 +5,7 @@ require 'helio/version'
 Gem::Specification.new do |s|
   s.name = 'helio-ruby'
   s.version = Helio::VERSION
-  s.required_ruby_version = '>= 2.0.0'
+  s.required_ruby_version = '>= 2.2.2'
   s.summary = 'Ruby bindings for the Helio API'
   s.description = 'Discover design insights with surveys and tests. See https://helio.app for details.'
   s.author = 'Helio'