diff --git a/Gemfile.lock b/Gemfile.lock
index 5f86bca..7ddb7ab 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,8 @@ GEM
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
     json (2.3.0)
-    kramdown (2.1.0)
+    kramdown (2.3.1)
+      rexml
     kramdown-parser-gfm (1.0.1)
       kramdown (~> 2.0)
     minitest (5.14.0)
@@ -107,6 +108,7 @@ GEM
     open4 (1.3.4)
     public_suffix (3.0.3)
     rake (13.0.1)
+    rexml (3.2.4)
     ruby-macho (1.4.0)
     sawyer (0.8.1)
       addressable (>= 2.3.5, < 2.6)