diff --git a/Gemfile b/Gemfile
index 089ae77..057e79c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,11 +8,11 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "~> 3.8.5"
+gem "jekyll", "~> 4.0.0"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
-gem "minima", "~> 2.0"
-gem "just-the-docs"
+gem "minima", "~> 2.5", ">= 2.5.1"
+gem "just-the-docs", ">= 0.2.8"
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
@@ -20,7 +20,7 @@ gem "just-the-docs"
 
 # If you have any plugins, put them here!
 group :jekyll_plugins do
-  gem "jekyll-feed", "~> 0.6"
+  gem "jekyll-feed", "~> 0.12", ">= 0.12.0"
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem