diff --git a/Gemfile.lock b/Gemfile.lock
index a0a5fca..c37bcbc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -41,6 +41,7 @@ GEM
     coderay (1.1.0)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
+    concurrent-ruby (1.1.10)
     debug_inspector (0.0.2)
     descendants_tracker (0.0.4)
       thread_safe (~> 0.3, >= 0.3.1)
@@ -80,7 +81,8 @@ GEM
       railties (>= 3.2.12)
     hashie (3.3.1)
     hike (1.2.3)
-    i18n (0.6.11)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     ice_nine (0.11.0)
     json (1.8.1)
     kramdown (1.5.0)