diff --git a/Gemfile.lock b/Gemfile.lock
index 268829a..d30803d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -44,7 +44,7 @@ GEM
       tzinfo (~> 1.1)
     arel (6.0.3)
     builder (3.2.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.7)
     database_cleaner (1.4.1)
     diff-lcs (1.2.5)
     erubis (2.7.0)
@@ -64,7 +64,7 @@ GEM
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
     pg (0.18.2)
-    rack (1.6.1)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.1)
@@ -115,7 +115,7 @@ GEM
     shoulda-context (1.2.1)
     shoulda-matchers (2.8.0)
       activesupport (>= 3.0.0)
-    sprockets (3.7.1)
+    sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.0)