diff --git a/Gemfile.lock b/Gemfile.lock
index df2a29f..cf2a9f2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -52,7 +52,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.10.0)
-    concurrent-ruby (1.0.2)
+    concurrent-ruby (1.1.5)
     debug_inspector (0.0.2)
     domain_name (0.5.20161021)
       unf (>= 0.0.5, < 1.0.0)
@@ -111,7 +111,7 @@ GEM
     pg (0.18.4)
     public_suffix (2.0.4)
     puma (3.6.0)
-    rack (2.0.1)
+    rack (2.0.8)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.0.1)
@@ -158,7 +158,7 @@ GEM
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
       spring (>= 1.2, < 3.0)
-    sprockets (3.7.0)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.0)