diff --git a/Gemfile.lock b/Gemfile.lock
index cfd2a1c..4f1582a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -130,7 +130,8 @@ GEM
     httpclient (2.8.3)
     json (2.2.0)
     jwt (2.1.0)
-    kramdown (2.1.0)
+    kramdown (2.3.0)
+      rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     launchy (2.4.3)
@@ -169,6 +170,7 @@ GEM
       declarative-option (< 0.2.0)
       uber (< 0.2.0)
     retriable (3.1.2)
+    rexml (3.2.4)
     rouge (2.0.7)
     rubyzip (1.2.4)
     sawyer (0.8.2)