diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index f5c35d2bc..b12917eb7 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -234,7 +234,8 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.6)
+    rexml (3.3.2)
+      strscan
     rouge (3.26.0)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
@@ -248,6 +249,7 @@ GEM
       faraday (>= 0.17.3, < 3)
     simpleidn (0.2.1)
       unf (~> 0.1.4)
+    strscan (3.1.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     thread_safe (0.3.6)