diff --git a/Gemfile.lock b/Gemfile.lock
index 557f94c..b6f9ac5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -52,7 +52,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.8)
     debug_inspector (0.0.2)
     erubis (2.7.0)
     execjs (2.7.0)
@@ -89,7 +89,7 @@ GEM
       pry (>= 0.10.4)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.6.5)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.8)
@@ -131,7 +131,7 @@ GEM
     slop (3.6.0)
     spring (2.0.1)
       activesupport (>= 4.2)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.0)