diff --git a/google-webfonts-rails.gemspec b/google-webfonts-rails.gemspec
index c0944fc..e2eb93c 100644
--- a/google-webfonts-rails.gemspec
+++ b/google-webfonts-rails.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |gem|
   gem.summary       = %q{A easiest way to introduce Google WebFonts to Rails application.}
   gem.homepage      = "https://github.com/misopeso/google-webfonts-rails"
 
-  gem.add_runtime_dependency 'activesupport', '> 3.2.0', '< 5.0'
+  gem.add_runtime_dependency 'activesupport', '> 3.2.0', '< 5.1'
 
   gem.add_development_dependency 'rake'
   gem.add_development_dependency 'rspec', '~> 2.12.0'
diff --git a/lib/google-webfonts/rails/helpers.rb b/lib/google-webfonts/rails/helpers.rb
index d76fce8..274f2f8 100644
--- a/lib/google-webfonts/rails/helpers.rb
+++ b/lib/google-webfonts/rails/helpers.rb
@@ -4,7 +4,7 @@ module Helpers
       extend ActiveSupport::Concern
 
       included do
-        helper_method :google_webfonts_init
+        helper_method :google_webfonts_init if respond_to?(:helper_method)
       end
 
       # Initialize WebFont Loader javascript. Put it in the head elements.
@@ -52,4 +52,4 @@ def loader_url(version)
       end
     end
   end
-end
\ No newline at end of file
+end