diff --git a/Gemfile.lock b/Gemfile.lock
index ed0b2eec..1375095b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,6 +15,7 @@ GEM
       execjs
     coffee-script-source (1.10.0)
     colorator (0.1)
+    concurrent-ruby (1.1.10)
     css_press (0.3.2)
       csspool-st (= 3.1.2)
       json
@@ -61,7 +62,8 @@ GEM
       multi_css (>= 0.1.0)
       multi_js (>= 0.1.0)
     htmlentities (4.3.4)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jekyll (3.1.6)
       colorator (~> 0.1)
       jekyll-sass-converter (~> 1.0)