diff --git a/Gemfile b/Gemfile
index 7a24eca2..e348b0c9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,10 +18,10 @@ group :mongoid do
   gem "bson_ext"
 end
 
-# group :data_mapper do
-#   gem "do_sqlite3", '>= 0.10.1'
-#   gem "dm-core", :git => "git://github.com/datamapper/dm-core.git"
-#   gem "dm-validations", :git => "git://github.com/datamapper/dm-more.git"
-#   gem "dm-timestamps", :git => "git://github.com/datamapper/dm-more.git"
-#   gem "dm-rails", :git => "git://github.com/datamapper/dm-rails.git"
-# end
+group :data_mapper do
+  gem "do_sqlite3", '>= 0.10.1'
+  gem "dm-core", :git => "git://github.com/datamapper/dm-core.git"
+  gem "dm-validations", :git => "git://github.com/datamapper/dm-more.git"
+  gem "dm-timestamps", :git => "git://github.com/datamapper/dm-more.git"
+  gem "dm-rails", :git => "git://github.com/datamapper/dm-rails.git"
+end