diff --git a/demo/Gemfile.lock b/demo/Gemfile.lock
index 32af8f3..3a86d5a 100644
--- a/demo/Gemfile.lock
+++ b/demo/Gemfile.lock
@@ -52,11 +52,13 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rouge (3.20.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
+    strscan (3.1.0)
     swiftfire-jekyll-theme (0.2.0)
       jekyll (> 3.6, < 5.0)
       jekyll-data (>= 1.0, < 2.0)