diff --git a/docs/Gemfile b/docs/Gemfile
index 1672d0d..d0dcccb 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -7,7 +7,7 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "~> 3.9"
+gem "jekyll", "~> 4.0"
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 gem "bulma-clean-theme"
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and