diff --git a/Gemfile.lock b/Gemfile.lock
index 27568b0..2613658 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -103,7 +103,7 @@ GEM
     treetop (1.4.12)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (0.3.37)
+    tzinfo (0.3.61)
     uglifier (1.3.0)
       execjs (>= 0.3.0)
       multi_json (~> 1.0, >= 1.0.2)