diff --git a/ruby/demo/Gemfile.lock b/ruby/demo/Gemfile.lock
index f2fbd7b..45089f6 100644
--- a/ruby/demo/Gemfile.lock
+++ b/ruby/demo/Gemfile.lock
@@ -37,11 +37,13 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.6.3)
+    concurrent-ruby (1.1.10)
     erubis (2.7.0)
     execjs (1.4.0)
       multi_json (~> 1.0)
     hike (1.2.3)
-    i18n (0.6.4)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     journey (1.0.4)
     jquery-rails (3.0.4)
       railties (>= 3.0, < 5.0)