diff --git a/Gemfile.lock b/Gemfile.lock
index 6d7e483..b2f261e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -34,7 +34,8 @@ GEM
       faraday (>= 0.8)
     git (1.6.0)
       rchardet (~> 1.8)
-    kramdown (2.1.0)
+    kramdown (2.3.1)
+      rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     multipart-post (2.1.1)
@@ -46,6 +47,7 @@ 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)