diff --git a/Gemfile.lock b/Gemfile.lock
index c264a72..1613974 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,6 +13,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.8.0)
+    concurrent-ruby (1.1.10)
     daemons (1.1.9)
     dashing (1.3.4)
       coffee-script (~> 2.2.0)
@@ -107,10 +108,10 @@ GEM
       eventmachine (>= 1.0.0)
       rack (>= 1.0.0)
     thor (0.18.1)
-    thread_safe (0.3.4)
+    thread_safe (0.3.6)
     tilt (1.4.1)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
 
 PLATFORMS
   ruby