diff --git a/Gemfile.lock b/Gemfile.lock
index 8c173fd..dce19ad 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -23,9 +23,11 @@ GEM
       tzinfo (~> 1.1)
     arel (6.0.0)
     builder (3.2.2)
+    concurrent-ruby (1.1.10)
     expectations (2.0.0)
       mocha (>= 0.5.5)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     json (1.8.2)
     metaclass (0.0.4)
     minitest (5.6.0)