diff --git a/Gemfile.lock b/Gemfile.lock
index 7bf6685..e88bc73 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -87,7 +87,8 @@ GEM
       html-pipeline (~> 2.2)
       jekyll (>= 2.0)
     json (2.3.0)
-    kramdown (2.3.0)
+    kramdown (2.3.1)
+      rexml
     liquid (3.0.6)
     listen (3.0.6)
       rb-fsevent (>= 0.9.3)
@@ -109,6 +110,7 @@ GEM
       ffi (>= 0.5.0)
     rdiscount (2.1.8)
     redcarpet (3.5.1)
+    rexml (3.2.4)
     rouge (1.10.1)
     safe_yaml (1.0.4)
     sass (3.4.21)