diff --git a/build_config.rb b/build_config.rb
index 431d6b2..7717d79 100644
--- a/build_config.rb
+++ b/build_config.rb
@@ -3,8 +3,5 @@
 
   conf.gembox 'default'
 
-  conf.gem :github => 'iij/mruby-io'
-  conf.gem :github => 'iij/mruby-mtest'
-  conf.gem :github => 'mattn/mruby-onig-regexp'
   conf.gem File.expand_path(File.dirname(__FILE__))
 end
diff --git a/mrbgem.rake b/mrbgem.rake
index b29ac9e..4e036e1 100644
--- a/mrbgem.rake
+++ b/mrbgem.rake
@@ -3,7 +3,10 @@ MRuby::Gem::Specification.new('mruby-optparse') do |spec|
   spec.author  = 'zzak'
   spec.summary = 'Command-line option analysis with the OptionParser class.'
 
-  spec.add_dependency 'mruby-io'
-  spec.add_dependency 'mruby-mtest'
-  spec.add_dependency 'mruby-onig-regexp'
+  spec.add_dependency 'mruby-io', :mgem => 'mruby-io'
+  spec.add_dependency 'mruby-mtest', :mgem => 'mruby-mtest'
+  spec.add_dependency 'mruby-onig-regexp', :mgem => 'mruby-onig-regexp'
+  spec.add_dependency 'mruby-catch-throw', :mgem => 'mruby-catch-throw'
+  spec.add_dependency 'mruby-array-ext', :core => 'mruby-array-ext'
+  spec.add_dependency 'mruby-hash-ext', :core => 'mruby-hash-ext'
 end