diff --git a/Gemfile.lock b/Gemfile.lock
index d77592a..a007fed 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,7 +38,7 @@ GEM
     arel (6.0.4)
     builder (3.2.3)
     coderay (1.1.1)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.9)
     database_cleaner (1.6.1)
     diff-lcs (1.3)
     erubis (2.7.0)
@@ -69,7 +69,7 @@ GEM
       slop (~> 3.4)
     rabl (0.11.6)
       activesupport (>= 2.3.14)
-    rack (1.6.8)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.8)
@@ -131,7 +131,7 @@ GEM
       activesupport (>= 4.2)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (3.7.1)
+    sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.0)