diff --git a/Gemfile.lock b/Gemfile.lock
index 88a2d3f..3158fd0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,7 +38,7 @@ GEM
       tzinfo (~> 1.1)
     arel (6.0.3)
     builder (3.2.2)
-    concurrent-ruby (1.0.2)
+    concurrent-ruby (1.1.5)
     crass (1.0.5)
     erubis (2.7.0)
     globalid (0.3.6)
@@ -62,7 +62,7 @@ GEM
     nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
     pg (0.17.1)
-    rack (1.6.4)
+    rack (1.6.11)
     rack-cors (0.2.9)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -101,7 +101,7 @@ GEM
       jquery-rails
       pg (>= 0.11, < 0.18)
       rails (>= 3.2.11)
-    sprockets (3.6.0)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.0.4)