diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 9475b4a3ee8..039480f8328 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -244,7 +244,7 @@ GEM
     rb-inotify (0.11.1)
       ffi (~> 1.0)
     redcarpet (3.6.0)
-    rexml (3.3.8)
+    rexml (3.3.9)
     rouge (3.30.0)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)