diff --git a/Gemfile.lock b/Gemfile.lock
index 42c16db2c..c9da2ed4c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -148,7 +148,7 @@ GEM
       execjs
     coffee-script-source (1.10.0)
     colorize (0.7.7)
-    concurrent-ruby (1.0.2)
+    concurrent-ruby (1.1.5)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     crass (1.0.2)
@@ -385,7 +385,7 @@ GEM
       activesupport (>= 3.0.0)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.6.8)
+    rack (1.6.11)
     rack-attack (5.0.1)
       rack
     rack-contrib (1.4.0)
@@ -508,7 +508,7 @@ GEM
     spring (1.7.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (3.7.0)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (2.3.3)