diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index b5d3788..1960eb6 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -13,6 +13,7 @@ GEM
       execjs
     coffee-script-source (1.10.0)
     colorator (1.1.0)
+    concurrent-ruby (1.1.10)
     ethon (0.9.1)
       ffi (>= 1.3.0)
     execjs (2.7.0)
@@ -52,7 +53,8 @@ GEM
     html-pipeline (2.4.2)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jekyll (3.2.1)
       colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)