diff --git a/Gemfile.lock b/Gemfile.lock
index 52f574ee..56af18c3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,14 +94,14 @@ GEM
     method_source (0.8.2)
     mime-types (1.25)
     minitest (5.0.8)
-    multi_json (1.8.2)
+    multi_json (1.15.0)
     mysql2 (0.3.13)
     polyglot (0.3.3)
     pry (0.9.12.2)
       coderay (~> 1.0.5)
       method_source (~> 0.8)
       slop (~> 3.4)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.2)
       rack (>= 1.0)
     rake (10.1.0)
@@ -125,7 +125,7 @@ GEM
       simplecov-html (~> 0.7.1)
     simplecov-html (0.7.1)
     slop (3.4.6)
-    sprockets (2.10.0)
+    sprockets (2.12.5)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)