diff --git a/Gemfile.lock b/Gemfile.lock
index a5378b21..21e40588 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -47,7 +47,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.5)
     crass (1.0.3)
     erubis (2.7.0)
     execjs (2.7.0)
@@ -79,7 +79,7 @@ GEM
     psych (2.0.17)
     puma (3.11.3)
     racc (1.4.14)
-    rack (1.6.9)
+    rack (1.6.11)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.10)
@@ -328,7 +328,7 @@ GEM
     simple_form (3.1.1)
       actionpack (~> 4.0)
       activemodel (~> 4.0)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)