Rakefile in group_cache_key-0.3.0 vs Rakefile in group_cache_key-0.4.0

@@ -41,10 +41,10 @@
 
 task :test => :check_dependencies
 
 task :default => :test
 
-require 'rake/rdoctask'
+require 'rdoc/task'
 Rake::RDocTask.new do |rdoc|
   if File.exist?('VERSION')
     version = File.read('VERSION')
   else
     version = ""