diff --git a/Gemfile.lock b/Gemfile.lock
index cfcfc3f..f6056e5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -91,7 +91,7 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     colorize (0.8.1)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.5)
     crass (1.0.3)
     daemons (1.2.3)
     database_cleaner (1.5.3)
@@ -173,7 +173,7 @@ GEM
     public_suffix (3.0.2)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.6.9)
+    rack (1.6.11)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.10)
@@ -247,7 +247,7 @@ GEM
       rubyzip (~> 1.2)
     silencer (1.0.0.rc3)
     slop (3.6.0)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)