diff --git a/Gemfile.lock b/Gemfile.lock
index 81cb4a2..9948746 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -118,7 +118,8 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    kramdown (2.1.0)
+    kramdown (2.3.1)
+      rexml
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -188,6 +189,7 @@ GEM
     responders (2.4.1)
       actionpack (>= 4.2.0, < 6.0)
       railties (>= 4.2.0, < 6.0)
+    rexml (3.2.4)
     ruby_dep (1.5.0)
     rubyzip (1.2.3)
     sass (3.7.4)