diff --git a/hartl-rails/hello-app/Gemfile.lock b/hartl-rails/hello-app/Gemfile.lock
index f37777e5..7e1d49ce 100644
--- a/hartl-rails/hello-app/Gemfile.lock
+++ b/hartl-rails/hello-app/Gemfile.lock
@@ -132,12 +132,12 @@ GEM
       sprockets (>= 3.0.0)
     sqlite3 (1.3.12)
     thor (0.19.4)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (2.0.6)
     turbolinks (5.0.1)
       turbolinks-source (~> 5)
     turbolinks-source (5.0.0)
-    tzinfo (1.2.2)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uglifier (3.0.0)
       execjs (>= 0.3.0, < 3)