diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 4aefc14..e46937c 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -58,7 +58,8 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rouge (3.30.0)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
@@ -67,6 +68,7 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+    strscan (3.1.0)
     webrick (1.8.1)
 
 PLATFORMS