mabmapper.gemspec in mabmapper-1.0.0.pre17 vs mabmapper.gemspec in mabmapper-1.0.0.pre18

@@ -20,10 +20,10 @@
   gem.executables   = ['mabmapper']
 
   gem.required_ruby_version = '>= 1.9.3'
 
   gem.add_dependency('nokogiri', '~> 1.6.0')
-  gem.add_dependency('activesupport', '~> 4.0.0')
+  gem.add_dependency('activesupport', '>= 4.0.0')
   gem.add_dependency('libxml-ruby', '~> 2.7.0')
   gem.add_dependency('oj', '~> 2.1.4')
   gem.add_dependency('stringex', '~> 2.1.0')
 
   gem.add_development_dependency('minitest',         '~> 4.7.5')