diff --git a/hello_app/Gemfile.lock b/hello_app/Gemfile.lock
index 5357939..286162b 100644
--- a/hello_app/Gemfile.lock
+++ b/hello_app/Gemfile.lock
@@ -153,7 +153,7 @@ GEM
     turbolinks (5.2.1)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)