diff --git a/Gemfile.lock b/Gemfile.lock
index ad0cded..4661b29 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -185,7 +185,7 @@ GEM
     treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (1.2.0)
+    tzinfo (1.2.1)
       thread_safe (~> 0.1)
     uglifier (2.5.0)
       execjs (>= 0.3.0)