diff --git a/Gemfile.lock b/Gemfile.lock
index 9726414..e997d09 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -50,7 +50,7 @@ GEM
     codeclimate-test-reporter (0.5.0)
       simplecov (>= 0.7.1, < 1.0.0)
     coderay (1.1.1)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.6)
     connection_pool (2.2.1)
     database_cleaner (1.4.1)
     diff-lcs (1.2.5)
@@ -87,7 +87,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.6.12)
+    rack (1.6.13)
     rack-protection (2.0.1)
       rack
     rack-test (0.6.3)
@@ -155,7 +155,7 @@ GEM
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.0)
     slop (3.6.0)
-    sprockets (3.7.1)
+    sprockets (4.0.0)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)