diff --git a/Gemfile.lock b/Gemfile.lock
index 2324f8bd..c59d364d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
       json (>= 1.5.1)
     bigdecimal (3.1.8)
     colorator (1.1.0)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.7)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)