diff --git a/Gemfile.lock b/Gemfile.lock
index 6e2452c..dd50ede 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -37,10 +37,12 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.10.0)
+    concurrent-ruby (1.1.10)
     erubis (2.7.0)
     execjs (2.6.0)
     hike (1.2.3)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jbuilder (2.4.0)
       activesupport (>= 3.0.0, < 5.1)
       multi_json (~> 1.2)