diff --git a/Gemfile b/Gemfile
index cf663f22a9e..08e62becf26 100644
--- a/Gemfile
+++ b/Gemfile
@@ -67,17 +67,19 @@ unless Bundler::Dependency::PLATFORM_MAP.include? :mri_21
    end
 end
 
-gem 'seed-fu', '~> 2.3.3'
 
 if rails_master?
   gem 'arel', git: 'https://github.com/rails/arel.git'
   gem 'rails', git: 'https://github.com/rails/rails.git'
+  gem 'rails-observers', git: 'https://github.com/SamSaffron/rails-observers.git'
+  gem 'seed-fu', git: 'https://github.com/SamSaffron/seed-fu.git', branch: 'discourse'
 else
+  gem 'seed-fu', '~> 2.3.3'
   gem 'rails'
+  gem 'rails-observers'
 end
 
 gem 'actionpack-action_caching'
-gem 'rails-observers'
 
 # Rails 4.1.6+ will relax the mail gem version requirement to `~> 2.5, >= 2.5.4`.
 # However, mail gem 2.6.x currently does not work with discourse because of the
@@ -144,8 +146,15 @@ gem 'omniauth-github-discourse', require: 'omniauth-github'
 gem 'omniauth-oauth2', require: false
 gem 'omniauth-google-oauth2'
 gem 'oj'
-# while resolving https://groups.google.com/forum/#!topic/ruby-pg/5_ylGmog1S4
-gem 'pg', '0.15.1'
+
+if rails_master?
+  # native casting
+  gem 'pg', '0.18.0.pre20141117110243'
+else
+  # while resolving https://groups.google.com/forum/#!topic/ruby-pg/5_ylGmog1S4
+  gem 'pg', '0.15.1'
+end
+
 gem 'pry-rails', require: false
 gem 'rake'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 0f56e0cbc1a..8c5c8a7b60f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -99,7 +99,7 @@ GEM
     fastimage (1.6.3)
       addressable (~> 2.3, >= 2.3.5)
     ffi (1.9.5)
-    flamegraph (0.0.8)
+    flamegraph (0.0.9)
       fast_stack
     fog (1.22.1)
       fog-brightbox
@@ -273,7 +273,7 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     raindrops (0.13.0)
-    rake (10.3.2)
+    rake (10.4.0)
     rake-compiler (0.9.3)
       rake
     rb-fsevent (0.9.4)
diff --git a/Gemfile_master.lock b/Gemfile_master.lock
index c962d2baecc..c3f6d3a39b4 100644
--- a/Gemfile_master.lock
+++ b/Gemfile_master.lock
@@ -7,66 +7,26 @@ GIT
       activemodel (>= 3.0)
 
 GIT
-  remote: https://github.com/rails/arel.git
-  revision: 1fefe71b1872c0a83f09231164863cd8dbb57174
+  remote: https://github.com/SamSaffron/rails-observers.git
+  revision: 7d2222d758603a004f6599f82a7068ffeb2d7ebf
   specs:
-    arel (6.0.0)
+    rails-observers (0.1.2)
+      activemodel (> 4.0)
 
 GIT
-  remote: https://github.com/rails/rails.git
-  revision: 2f8be7ebafcf7815f9f3ec7983789157525a60fa
+  remote: https://github.com/SamSaffron/seed-fu.git
+  revision: d93df3b6364ea938d87c5629bf950b0d1ffe037e
+  branch: discourse
   specs:
-    actionmailer (4.2.0.beta4)
-      actionpack (= 4.2.0.beta4)
-      actionview (= 4.2.0.beta4)
-      activejob (= 4.2.0.beta4)
-      mail (~> 2.5, >= 2.5.4)
-      rails-dom-testing (~> 1.0, >= 1.0.5)
-    actionpack (4.2.0.beta4)
-      actionview (= 4.2.0.beta4)
-      activesupport (= 4.2.0.beta4)
-      rack (~> 1.6.0.beta)
-      rack-test (~> 0.6.2)
-      rails-dom-testing (~> 1.0, >= 1.0.5)
-      rails-html-sanitizer (~> 1.0, >= 1.0.1)
-    actionview (4.2.0.beta4)
-      activesupport (= 4.2.0.beta4)
-      builder (~> 3.1)
-      erubis (~> 2.7.0)
-      rails-dom-testing (~> 1.0, >= 1.0.5)
-      rails-html-sanitizer (~> 1.0, >= 1.0.1)
-    activejob (4.2.0.beta4)
-      activesupport (= 4.2.0.beta4)
-      globalid (>= 0.3.0)
-    activemodel (4.2.0.beta4)
-      activesupport (= 4.2.0.beta4)
-      builder (~> 3.1)
-    activerecord (4.2.0.beta4)
-      activemodel (= 4.2.0.beta4)
-      activesupport (= 4.2.0.beta4)
-      arel (~> 6.0)
-    activesupport (4.2.0.beta4)
-      i18n (>= 0.7.0.beta1, < 0.8)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.1)
-      tzinfo (~> 1.1)
-    rails (4.2.0.beta4)
-      actionmailer (= 4.2.0.beta4)
-      actionpack (= 4.2.0.beta4)
-      actionview (= 4.2.0.beta4)
-      activejob (= 4.2.0.beta4)
-      activemodel (= 4.2.0.beta4)
-      activerecord (= 4.2.0.beta4)
-      activesupport (= 4.2.0.beta4)
-      bundler (>= 1.3.0, < 2.0)
-      railties (= 4.2.0.beta4)
-      sprockets-rails (~> 3.0.0.beta1)
-    railties (4.2.0.beta4)
-      actionpack (= 4.2.0.beta4)
-      activesupport (= 4.2.0.beta4)
-      rake (>= 0.8.7)
-      thor (>= 0.18.1, < 2.0)
+    seed-fu (2.3.3)
+      activerecord (>= 3.1)
+      activesupport (>= 3.1)
+
+GIT
+  remote: https://github.com/rails/arel.git
+  revision: 98fc25991137ee09b6800578117f8c1c322680f2
+  specs:
+    arel (6.0.0)
 
 GIT
   remote: https://github.com/rails/sass-rails.git
@@ -78,6 +38,61 @@ GIT
       sprockets (~> 2.12)
       sprockets-rails (>= 2.0, < 4.0)
 
+PATH
+  remote: ../rails
+  specs:
+    actionmailer (5.0.0.alpha)
+      actionpack (= 5.0.0.alpha)
+      actionview (= 5.0.0.alpha)
+      activejob (= 5.0.0.alpha)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 1.0, >= 1.0.5)
+    actionpack (5.0.0.alpha)
+      actionview (= 5.0.0.alpha)
+      activesupport (= 5.0.0.alpha)
+      rack (~> 1.6.0.beta2)
+      rack-test (~> 0.6.2)
+      rails-dom-testing (~> 1.0, >= 1.0.5)
+      rails-html-sanitizer (~> 1.0, >= 1.0.1)
+    actionview (5.0.0.alpha)
+      activesupport (= 5.0.0.alpha)
+      builder (~> 3.1)
+      erubis (~> 2.7.0)
+      rails-dom-testing (~> 1.0, >= 1.0.5)
+      rails-html-sanitizer (~> 1.0, >= 1.0.1)
+    activejob (5.0.0.alpha)
+      activesupport (= 5.0.0.alpha)
+      globalid (>= 0.3.0)
+    activemodel (5.0.0.alpha)
+      activesupport (= 5.0.0.alpha)
+      builder (~> 3.1)
+    activerecord (5.0.0.alpha)
+      activemodel (= 5.0.0.alpha)
+      activesupport (= 5.0.0.alpha)
+      arel (~> 6.0)
+    activesupport (5.0.0.alpha)
+      i18n (>= 0.7.0.beta1, < 0.8)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.1)
+      tzinfo (~> 1.1)
+    rails (5.0.0.alpha)
+      actionmailer (= 5.0.0.alpha)
+      actionpack (= 5.0.0.alpha)
+      actionview (= 5.0.0.alpha)
+      activejob (= 5.0.0.alpha)
+      activemodel (= 5.0.0.alpha)
+      activerecord (= 5.0.0.alpha)
+      activesupport (= 5.0.0.alpha)
+      bundler (>= 1.3.0, < 2.0)
+      railties (= 5.0.0.alpha)
+      sprockets-rails
+    railties (5.0.0.alpha)
+      actionpack (= 5.0.0.alpha)
+      activesupport (= 5.0.0.alpha)
+      rake (>= 0.8.7)
+      thor (>= 0.18.1, < 2.0)
+
 PATH
   remote: vendor/gems/rails_multisite
   specs:
@@ -150,7 +165,7 @@ GEM
     fastimage (1.6.3)
       addressable (~> 2.3, >= 2.3.5)
     ffi (1.9.5)
-    flamegraph (0.0.8)
+    flamegraph (0.0.9)
       fast_stack
     fog (1.22.1)
       fog-brightbox
@@ -285,7 +300,7 @@ GEM
     openid-redis-store (0.0.2)
       redis
       ruby-openid
-    pg (0.15.1)
+    pg (0.18.0.pre20141117110243)
     polyglot (0.3.5)
     progress (3.0.1)
     pry (0.10.1)
@@ -300,7 +315,7 @@ GEM
       rack (>= 1.1, < 2.0)
     qunit-rails (0.0.7)
       railties
-    rack (1.6.0.beta)
+    rack (1.6.0.beta2)
     rack-mini-profiler (0.9.2)
       rack (>= 1.1.3)
     rack-openid (1.3.1)
@@ -318,8 +333,6 @@ GEM
       rails-deprecated_sanitizer (>= 1.0.1)
     rails-html-sanitizer (1.0.1)
       loofah (~> 2.0)
-    rails-observers (0.1.2)
-      activemodel (~> 4.0)
     raindrops (0.13.0)
     rake (10.4.0)
     rake-compiler (0.9.3)
@@ -373,9 +386,6 @@ GEM
       nokogiri (>= 1.4.4)
       nokogumbo (= 1.1.12)
     sass (3.2.19)
-    seed-fu (2.3.3)
-      activerecord (>= 3.1, < 4.2)
-      activesupport (>= 3.1, < 4.2)
     shoulda (3.5.0)
       shoulda-context (~> 1.0, >= 1.0.1)
       shoulda-matchers (>= 1.4.1, < 3.0)
@@ -498,7 +508,7 @@ DEPENDENCIES
   omniauth-twitter
   onebox
   openid-redis-store
-  pg (= 0.15.1)
+  pg (= 0.18.0.pre20141117110243)
   pry-nav
   pry-rails
   puma
@@ -506,7 +516,7 @@ DEPENDENCIES
   rack-mini-profiler
   rack-protection
   rails!
-  rails-observers
+  rails-observers!
   rails_multisite!
   rake
   rb-fsevent
@@ -525,7 +535,7 @@ DEPENDENCIES
   sanitize
   sass
   sass-rails!
-  seed-fu (~> 2.3.3)
+  seed-fu!
   shoulda
   sidekiq
   simple-rss