diff --git a/Gemfile.lock b/Gemfile.lock
index d44e33fed..3a00bb1c5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,7 +33,8 @@ GEM
     image_size (2.0.2)
     json-schema (2.8.1)
       addressable (>= 2.4)
-    kramdown (2.1.0)
+    kramdown (2.3.0)
+      rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     multipart-post (2.1.1)
@@ -45,6 +46,7 @@ GEM
     open4 (1.3.4)
     public_suffix (4.0.4)
     rchardet (1.8.0)
+    rexml (3.2.4)
     sawyer (0.8.2)
       addressable (>= 2.3.5)
       faraday (> 0.8, < 2.0)