diff --git a/Gemfile.lock b/Gemfile.lock
index d0fcc8c..aca3e17 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.10.0)
-    concurrent-ruby (1.0.0)
+    concurrent-ruby (1.1.5)
     debug_inspector (0.0.2)
     erubis (2.7.0)
     execjs (2.6.0)
@@ -74,7 +74,7 @@ GEM
     nokogiri (1.6.7.1)
       mini_portile2 (~> 2.0.0.rc2)
     pg (0.18.4)
-    rack (1.6.4)
+    rack (1.6.11)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.4)
@@ -124,7 +124,7 @@ GEM
       railties (>= 3.1, < 5.0)
       slim (~> 3.0)
     spring (1.6.1)
-    sprockets (3.5.2)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.0.0)