diff --git a/presentations/join-the-ruby-line/todo/Gemfile.lock b/presentations/join-the-ruby-line/todo/Gemfile.lock
index 4e2ca11..9112bbc 100644
--- a/presentations/join-the-ruby-line/todo/Gemfile.lock
+++ b/presentations/join-the-ruby-line/todo/Gemfile.lock
@@ -37,12 +37,13 @@ GEM
       rb-inotify (>= 0.9)
     method_source (0.8.2)
     mime-types (2.4.3)
-    mini_portile (0.6.2)
+    mini_portile2 (2.8.0)
     mongo (1.9.2)
       bson (~> 1.9.2)
     multi_json (1.10.1)
-    nokogiri (1.6.6.2)
-      mini_portile (~> 0.6.0)
+    nokogiri (1.13.9)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     opal (0.6.3)
       source_map
       sprockets
@@ -59,6 +60,7 @@ GEM
       coderay (~> 1.0)
       method_source (~> 0.8)
       slop (~> 3.4)
+    racc (1.6.0)
     rack (1.5.2)
     rack-mount (0.8.3)
       rack (>= 1.0.0)