diff --git a/Gemfile b/Gemfile
index 219280ae8..f4a56aa48 100644
--- a/Gemfile
+++ b/Gemfile
@@ -45,6 +45,9 @@ end
 
 # configuration
 
+group :heroku do
+  gem 'pg'
+end
 
 gem 'settingslogic', '2.0.6'
 # database
diff --git a/Gemfile.lock b/Gemfile.lock
index 91b32ae15..a648ee77b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -314,6 +314,7 @@ GEM
     parallel (0.5.11)
     parallel_tests (0.6.11)
       parallel
+    pg (0.12.2)
     polyglot (0.3.3)
     rack (1.2.4)
     rack-mobile-detect (0.3.0)
@@ -501,6 +502,7 @@ DEPENDENCIES
   omniauth-tumblr
   omniauth-twitter
   parallel_tests
+  pg
   rails (= 3.0.11)
   rails-i18n
   redcarpet (= 2.0.0)