diff --git a/Gemfile.lock b/Gemfile.lock
index 8351a0e..5de7974 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
     colorator (1.1.0)
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.3.7)
     dnsruby (1.61.2)
       addressable (~> 2.5)
     em-websocket (0.5.1)