diff --git a/Gemfile.lock b/Gemfile.lock
index fc55551..9469acb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,7 +104,7 @@ GEM
     treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (0.3.42)
+    tzinfo (0.3.61)
     uglifier (2.6.0)
       execjs (>= 0.3.0)
       json (>= 1.8.0)