diff --git a/Gemfile.lock b/Gemfile.lock
index b30e9d5..75a29b2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -93,7 +93,7 @@ GEM
     treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (0.3.39)
+    tzinfo (0.3.61)
     uglifier (2.5.0)
       execjs (>= 0.3.0)
       json (>= 1.8.0)