diff --git a/Gemfile.lock b/Gemfile.lock
index 458156f..f421417 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,6 +7,7 @@ GEM
       chunky_png (~> 1.2)
       fssm (>= 0.2.7)
       sass (~> 3.1)
+    concurrent-ruby (1.1.10)
     fssm (0.2.7)
     haml (3.1.2)
     i18n (0.6.0)
@@ -22,7 +23,8 @@ GEM
       tilt (~> 1.3)
       tzinfo
     tilt (1.3.2)
-    tzinfo (0.3.29)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
 
 PLATFORMS
   ruby