diff --git a/Gemfile.lock b/Gemfile.lock
index 1e1301b..1439b8e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,7 +35,8 @@ GEM
     faraday-http-cache (2.0.0)
       faraday (~> 0.8)
     git (1.5.0)
-    kramdown (2.1.0)
+    kramdown (2.3.1)
+      rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     multipart-post (2.1.1)
@@ -49,6 +50,7 @@ GEM
       ruby-ll (~> 2.1)
     open4 (1.3.4)
     public_suffix (4.0.3)
+    rexml (3.2.4)
     ruby-ll (2.1.2)
       ansi
       ast