diff --git a/Gemfile.lock b/Gemfile.lock
index a0a5fca..c21aef0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -83,7 +83,8 @@ GEM
     i18n (0.6.11)
     ice_nine (0.11.0)
     json (1.8.1)
-    kramdown (1.5.0)
+    kramdown (2.4.0)
+      rexml
     mail (2.6.3)
       mime-types (>= 1.16, < 3)
     method_source (0.8.2)
@@ -136,6 +137,7 @@ GEM
     rake (10.3.2)
     responders (1.1.1)
       railties (>= 3.2, < 4.2)
+    rexml (3.2.5)
     slop (3.6.0)
     spring (1.1.3)
     sprockets (2.12.3)