diff --git a/presentations/join-the-ruby-line/todo/Gemfile.lock b/presentations/join-the-ruby-line/todo/Gemfile.lock
index 4e2ca11..cd14ded 100644
--- a/presentations/join-the-ruby-line/todo/Gemfile.lock
+++ b/presentations/join-the-ruby-line/todo/Gemfile.lock
@@ -74,7 +74,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.1.0)
     rspec-support (3.1.2)
-    rubyzip (1.1.7)
+    rubyzip (1.3.0)
     sass (3.2.19)
     selenium-webdriver (2.43.0)
       childprocess (~> 0.5)