diff --git a/Gemfile.lock b/Gemfile.lock
index e5365ba..24e9eb9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,8 +46,8 @@ GEM
       concurrent-ruby (~> 1.1)
       sorted_set (~> 1.0)
     json_schema (0.21.0)
-    kramdown (2.4.0)
-      rexml
+    kramdown (2.5.0)
+      rexml (>= 3.3.6)
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)