diff --git a/Gemfile.lock b/Gemfile.lock
index a808b09..9907f6d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -47,7 +47,8 @@ GEM
       orm_adapter (~> 0.0.3)
       railties (~> 3.1)
       warden (~> 1.1.1)
-    dragonfly (0.9.12)
+    dragonfly (0.9.15)
+      multi_json (~> 1.0)
       rack
     erubis (2.7.0)
     excon (0.16.10)
@@ -92,7 +93,7 @@ GEM
       railties (~> 3.0)
     pg (0.14.1)
     polyglot (0.3.3)
-    rack (1.4.1)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-ssl (1.3.2)