diff --git a/Gemfile b/Gemfile
index fd132fe..b5c1b73 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,6 +32,8 @@ gem 'omniauth-openid'
 # for file upload ( -> avatar )
 gem 'paperclip',  '~> 2.3'
 
+gem 'pg', group: :production
+
 group :assets do
   gem 'sass-rails',   '~> 3.2.3'
   gem 'coffee-rails', '~> 3.2.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index e7f1466..7fe100e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,6 +110,7 @@ GEM
       activesupport (>= 2.3.2)
       cocaine (>= 0.0.2)
       mime-types
+    pg (0.14.1)
     polyglot (0.3.3)
     rack (1.4.3)
     rack-cache (1.2)
@@ -197,6 +198,7 @@ DEPENDENCIES
   omniauth-facebook
   omniauth-openid
   paperclip (~> 2.3)
+  pg
   rails (= 3.2.11)
   rake
   redis