diff --git a/Gemfile.lock b/Gemfile.lock
index d2860e39..3795e988 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,8 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.6)
+    rexml (3.3.3)
+      strscan
     rouge (3.30.0)
     ruby2_keywords (0.0.5)
     safe_yaml (1.0.5)
@@ -101,6 +102,7 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+    strscan (3.1.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     webrick (1.7.0)