diff --git a/Gemfile.lock b/Gemfile.lock
index 1ce5f7f..253c590 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -86,7 +86,8 @@ GEM
       sass (~> 3.4)
       sqlite3 (~> 1.3)
       xcinvoke (~> 0.3.0)
-    kramdown (2.1.0)
+    kramdown (2.3.1)
+      rexml
     kramdown-parser-gfm (1.0.1)
       kramdown (~> 2.0)
     liferaft (0.0.6)
@@ -106,6 +107,7 @@ GEM
     rb-inotify (0.10.0)
       ffi (~> 1.0)
     redcarpet (3.4.0)
+    rexml (3.2.4)
     rouge (3.3.0)
     ruby-macho (1.4.0)
     sass (3.7.3)