diff --git a/Gemfile.lock b/Gemfile.lock
index c7413fe1..7a27d135 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -79,7 +79,8 @@ GEM
       jekyll (>= 3.7, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (2.1.0)
+    kramdown (2.3.1)
+      rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     listen (3.2.1)
@@ -103,6 +104,7 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    rexml (3.2.4)
     rouge (3.14.0)
     ruby-enum (0.7.2)
       i18n