diff --git a/presentations/ember-js-vienna/todo/Gemfile.lock b/presentations/ember-js-vienna/todo/Gemfile.lock
index ee5174b..e5e33c8 100644
--- a/presentations/ember-js-vienna/todo/Gemfile.lock
+++ b/presentations/ember-js-vienna/todo/Gemfile.lock
@@ -53,12 +53,13 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.1009)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.8.0)
     mongo (1.9.2)
       bson (~> 1.9.2)
     multi_json (1.14.1)
-    nokogiri (1.10.9)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.13.9)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     opal (0.6.3)
       source_map
       sprockets
@@ -75,6 +76,7 @@ GEM
       coderay (~> 1.0)
       method_source (~> 0.8)
       slop (~> 3.4)
+    racc (1.6.0)
     rack (1.5.5)
     rack-mount (0.8.3)
       rack (>= 1.0.0)