diff --git a/Gemfile.lock b/Gemfile.lock
index d886ade..c5848b8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -53,7 +53,8 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.4)
+    rexml (3.3.3)
+      strscan
     rouge (3.23.0)
     rubyzip (2.3.0)
     safe_yaml (1.0.5)
@@ -62,6 +63,7 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+    strscan (3.1.0)
 
 PLATFORMS
   ruby