diff --git a/Gemfile.lock b/Gemfile.lock
index a9b5802..075fdd0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -61,7 +61,8 @@ GEM
     minitest (5.8.4)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
-    rack (1.6.4)
+    pg (0.21.0)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5)
@@ -107,6 +108,7 @@ PLATFORMS
 
 DEPENDENCIES
   bulk_insert!
+  pg (< 1.0)
   rails (>= 4.2.0)
   sqlite3