diff --git a/docs/Gemfile b/docs/Gemfile
index 82dd0ac..40b28dc 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -11,6 +11,7 @@ source "https://rubygems.org"
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 #gem "minima", "~> 2.5"
 gem "jekyll-docs-theme"
+gem "kramdown-parser-gfm" if ENV["JEKYLL_VERSION"] == "~> 3.9"
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
 gem "github-pages", group: :jekyll_plugins