diff --git a/Gemfile.lock b/Gemfile.lock
index 584427e..bf4e4e3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -93,7 +93,8 @@ GEM
       transproc (~> 1.0)
     jaro_winkler (1.5.3)
     json (2.2.0)
-    kramdown (2.1.0)
+    kramdown (2.3.0)
+      rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     method_source (0.9.2)
@@ -116,6 +117,7 @@ GEM
     public_suffix (3.1.1)
     rainbow (3.0.0)
     rake (10.5.0)
+    rexml (3.2.4)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)