diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index b97cc1d2f..5e4cf8060 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     coffee-script-source (1.12.2)
     colorator (1.1.0)
     commonmarker (0.23.12)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     csv (3.3.5)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)