diff --git a/Gemfile b/Gemfile
index d0f7a86..5138c5e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,10 @@ gemspec
 gem "rake"
 gem "minitest"
 
-if RUBY_VERSION < '2.1'
+if RUBY_VERSION < '2.0'
+  gem 'psych', '> 2.0.0'
+  gem 'rexml', '< 3.1'
+elsif RUBY_VERSION < '2.1'
   gem 'psych', '> 2.0.0'
   gem 'rexml', '< 3.2.5'
 end