diff --git a/Gemfile b/Gemfile
index 931c8e85bcc91ddd47956efdf00dde93875d5fcd..fa17d217c9726449037bf3ee76e6ec64aee7229c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -81,7 +81,7 @@ platforms :ruby do
   gem 'sqlite3', '~> 1.3.6'
 
   group :db do
-    gem 'pg', '>= 0.11.0'
+    gem 'pg', '>= 0.15.0'
     gem 'mysql', '>= 2.9.0'
     gem 'mysql2', '>= 0.3.13'
   end
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 9941f74766bd03405d1126eef64ee3a9f34f0329..6310d7019279ca34fa2fea054beea6dca2727fdc 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -13,7 +13,7 @@
 require 'arel/visitors/bind_visitor'
 
 # Make sure we're using pg high enough for PGResult#values
-gem 'pg', '~> 0.11'
+gem 'pg', '~> 0.15'
 require 'pg'
 
 require 'ipaddr'
@@ -596,9 +596,7 @@ def exec_cache(sql, name, binds)
           }
 
           log(sql, name, type_casted_binds, stmt_key) do
-            @connection.send_query_prepared(stmt_key, type_casted_binds.map { |_, val| val })
-            @connection.block
-            @connection.get_last_result
+            @connection.exec_prepared(stmt_key, type_casted_binds.map { |_, val| val })
           end
         rescue ActiveRecord::StatementInvalid => e
           pgerror = e.original_exception