diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 4864af5683..b7d058260b 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -16,7 +16,7 @@ GEM
     colorator (1.1.0)
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.9)
     dnsruby (1.61.6)
       simpleidn (~> 0.1)
     em-websocket (0.5.2)