diff --git a/Gemfile.lock b/Gemfile.lock
index 5f5b90d..27e8b88 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -71,7 +71,7 @@ GEM
     treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (0.3.39)
+    tzinfo (0.3.61)
 
 PLATFORMS
   ruby