diff --git a/gemfiles/rails32.gemfile b/gemfiles/rails32.gemfile
index 7b6a349..7b74c3a 100644
--- a/gemfiles/rails32.gemfile
+++ b/gemfiles/rails32.gemfile
@@ -14,6 +14,7 @@ platforms :ruby, :mswin, :mingw do
 end
 
 group :test do
+  gem 'public_suffix', '< 1.5.0'
   gem 'capybara', '>= 2.0.3'
   gem 'minitest'
   gem 'minitest-rails'
diff --git a/gemfiles/rails40.gemfile b/gemfiles/rails40.gemfile
index 4d5be8a..465746e 100644
--- a/gemfiles/rails40.gemfile
+++ b/gemfiles/rails40.gemfile
@@ -14,6 +14,7 @@ platforms :ruby, :mswin, :mingw do
 end
 
 group :test do
+  gem 'public_suffix', '< 1.5.0'
   gem 'capybara', '>= 2.0.3'
   gem 'minitest'
   gem 'minitest-rails'
diff --git a/tests/test_app/Gemfile b/tests/test_app/Gemfile
index 1b93b78..06433ab 100644
--- a/tests/test_app/Gemfile
+++ b/tests/test_app/Gemfile
@@ -2,6 +2,7 @@ source 'https://rubygems.org'
 
 gem 'rails', '~> 3.2'
 gem 'rake', '< 11.0'
+gem 'public_suffix', '< 1.5.0'
 
 gem 'impressionist', :path => '../../'