diff --git a/Gemfile.lock b/Gemfile.lock
index dfabb9e..df2aca7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -16,7 +16,7 @@ GEM
   specs:
     awesome_print (1.8.0)
     coderay (1.1.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.3.7)
     diff-lcs (1.3)
     faker (1.9.1)
       i18n (>= 0.7)