diff --git a/Gemfile.lock b/Gemfile.lock
index 2867b0e33c5..a0f80e6515b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -191,7 +191,7 @@ GEM
     treetop (1.4.10)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (0.3.30)
+    tzinfo (0.3.31)
     validates_url_format_of (0.2.0)
       activerecord (~> 3.0.10)
     webmock (1.7.7)