diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 5184b30b3..bdc13fed2 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -227,7 +227,8 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.4)
+    rexml (3.3.6)
+      strscan
     rouge (3.23.0)
     ruby-enum (0.8.0)
       i18n
@@ -244,6 +245,7 @@ GEM
       faraday (> 0.8, < 2.0)
     simpleidn (0.1.1)
       unf (~> 0.1.4)
+    strscan (3.1.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     typhoeus (1.4.0)