diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index b4d54631..23a35f0b 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -246,7 +246,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.3.8)
+    rexml (3.3.9)
     rouge (3.30.0)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)