diff --git a/Gemfile.lock b/Gemfile.lock
index 7563082..8213761 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,7 +38,7 @@ GEM
       tzinfo (~> 1.1)
     arel (6.0.3)
     builder (3.2.2)
-    concurrent-ruby (1.0.3)
+    concurrent-ruby (1.0.4)
     erubis (2.7.0)
     globalid (0.3.7)
       activesupport (>= 4.1.0)