diff --git a/examples/rails_4_button_example/Gemfile.lock b/examples/rails_4_button_example/Gemfile.lock
index 9597a9d..1bcfa97 100644
--- a/examples/rails_4_button_example/Gemfile.lock
+++ b/examples/rails_4_button_example/Gemfile.lock
@@ -123,11 +123,11 @@ GEM
     sqlite3 (1.3.10)
     state_pattern (2.0.2)
     thor (0.19.1)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (1.4.1)
     turbolinks (2.5.3)
       coffee-rails
-    tzinfo (1.2.2)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uglifier (2.7.1)
       execjs (>= 0.3.0)