diff --git a/Gemfile.lock b/Gemfile.lock
index 4cf9874..f89bcf2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -42,6 +42,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.9.1.1)
+    concurrent-ruby (1.1.10)
     descendants_tracker (0.0.4)
       thread_safe (~> 0.3, >= 0.3.1)
     equalizer (0.0.11)
@@ -59,7 +60,8 @@ GEM
       virtus (>= 1.0.0)
     hashie (3.4.1)
     hike (1.2.3)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     ice_nine (0.11.1)
     jbuilder (2.2.16)
       activesupport (>= 3.0.0, < 5)