diff --git a/Gemfile.lock b/Gemfile.lock
index ff51ca4..989d656 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -50,7 +50,7 @@ GEM
       treetop (~> 1.4.8)
     mime-types (1.23)
     minitest (4.7.5)
-    multi_json (1.7.7)
+    multi_json (1.15.0)
     paperclip (3.4.2)
       activemodel (>= 3.0.0)
       activerecord (>= 3.0.0)
@@ -58,7 +58,7 @@ GEM
       cocaine (~> 0.5.0)
       mime-types
     polyglot (0.3.3)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.2)
       rack (>= 1.0)
     rails (4.0.0)
@@ -84,7 +84,7 @@ GEM
       diff-lcs (>= 1.1.3, < 2.0)
     rspec-mocks (2.13.1)
     safe_yaml (0.9.3)
-    sprockets (2.10.0)
+    sprockets (2.12.5)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)