diff --git a/Gemfile.lock b/Gemfile.lock
index 3a4025d..34173d3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -61,7 +61,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.8)
     crass (1.0.3)
     debug_inspector (0.0.3)
     devise (3.5.6)
@@ -110,7 +110,7 @@ GEM
       mime-types
       mimemagic (~> 0.3.0)
     pg (0.21.0)
-    rack (1.6.8)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5)
@@ -166,7 +166,7 @@ GEM
       rdoc (~> 4.0)
     spring (2.0.2)
       activesupport (>= 4.2)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)