diff --git a/Gemfile b/Gemfile
index 5e94baed6..76a25198c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -107,7 +107,8 @@ gem 'omniauth-oauth2', require: false
 gem 'omniauth-browserid', git: 'https://github.com/callahad/omniauth-browserid.git', branch: 'observer_api'
 gem 'omniauth-cas'
 gem 'oj'
-gem 'pg'
+# while resolving https://groups.google.com/forum/#!topic/ruby-pg/5_ylGmog1S4
+gem 'pg', '0.15.1'
 gem 'rake'
 
 
diff --git a/Gemfile_rails4.lock b/Gemfile_rails4.lock
index 7f7100dd1..9a630f1e7 100644
--- a/Gemfile_rails4.lock
+++ b/Gemfile_rails4.lock
@@ -271,7 +271,7 @@ GEM
     openid-redis-store (0.0.2)
       redis
       ruby-openid
-    pg (0.17.0)
+    pg (0.15.1)
     polyglot (0.3.3)
     progress (3.0.0)
     pry (0.9.12.4)
@@ -491,7 +491,7 @@ DEPENDENCIES
   omniauth-openid
   omniauth-twitter
   openid-redis-store
-  pg
+  pg (= 0.15.1)
   pry-nav
   pry-rails
   puma