diff --git a/Training/to_do_list/Gemfile.lock b/Training/to_do_list/Gemfile.lock
index 1af2011..516091c 100644
--- a/Training/to_do_list/Gemfile.lock
+++ b/Training/to_do_list/Gemfile.lock
@@ -172,7 +172,7 @@ GEM
     turbolinks (5.2.1)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)
-    tzinfo (1.2.7)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)