diff --git a/Gemfile.lock b/Gemfile.lock
index fdb0996..d621f6b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,8 +25,10 @@ GEM
       rspec-its
       term-ansicolor
       thor
+    concurrent-ruby (1.1.10)
     diff-lcs (1.2.5)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jmespath (1.3.1)
     json (1.8.3)
     minitest (5.9.0)