diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 310da85a17..dd25ed110b 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -76,7 +76,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.8)
+    rexml (3.3.9)
     rouge (4.0.1)
     safe_yaml (1.0.5)
     sassc (2.4.0)