diff --git a/Gemfile.lock b/Gemfile.lock
index 9740ffc..a163339 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -320,8 +320,9 @@ GEM
     simple_oauth (0.3.1)
     slop (3.6.0)
     spring (1.3.4)
-    sprockets (3.0.1)
-      rack (~> 1.0)
+    sprockets (3.7.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
     sprockets-rails (2.2.4)
       actionpack (>= 3.0)
       activesupport (>= 3.0)