diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 21b516d8..083a8730 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -21,7 +21,7 @@ GEM
     coffee-script-source (1.11.1)
     colorator (1.1.0)
     commonmarker (0.23.10)
-    concurrent-ruby (1.2.2)
+    concurrent-ruby (1.2.3)
     dnsruby (1.61.9)
       simpleidn (~> 0.1)
     em-websocket (0.5.3)