diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 155a314..503b03b 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -229,7 +229,7 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rouge (3.30.0)
     ruby2_keywords (0.0.2)
     rubyzip (2.3.0)