diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index f82347d8b8..117cb1691e 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
     coffee-script-source (1.11.1)
     colorator (1.1.0)
     commonmarker (0.23.4)
-    concurrent-ruby (1.1.9)
+    concurrent-ruby (1.1.10)
     dnsruby (1.61.9)
       simpleidn (~> 0.1)
     em-websocket (0.5.3)