diff --git a/examples/middleman/Gemfile.lock b/examples/middleman/Gemfile.lock
index 5ac6b1e1043c..a5a5a9c4004d 100644
--- a/examples/middleman/Gemfile.lock
+++ b/examples/middleman/Gemfile.lock
@@ -87,10 +87,12 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.6)
+    rexml (3.3.3)
+      strscan
     sassc (2.4.0)
       ffi (~> 1.9)
     servolux (0.13.0)
+    strscan (3.1.0)
     temple (0.10.3)
     thor (1.2.2)
     tilt (2.0.11)