diff --git a/wkhtmltopdf-binary.gemspec b/wkhtmltopdf-binary.gemspec
index 51ef187c..8709910d 100644
--- a/wkhtmltopdf-binary.gemspec
+++ b/wkhtmltopdf-binary.gemspec
@@ -5,8 +5,8 @@ Gem::Specification.new do |s|
   s.summary = 'Provides binaries for WKHTMLTOPDF project in an easily accessible package.'
   s.description = ''
 
-  s.required_ruby_version = '>= 1.8.7'
-  s.required_rubygems_version = ">= 1.3.6"
+  s.required_ruby_version = '> 2.0.0'
+  s.required_rubygems_version = "> 1.3.6"
 
   s.author = '- Research Information Systems, The University of Iowa'
   s.homepage = ''