diff --git a/Gemfile b/Gemfile
index 60af8e3..1941b4f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ ruby RUBY_VERSION
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", ">= 3.8.5"
+gem "jekyll", "= 4.0.0"
 
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
diff --git a/Gemfile.lock b/Gemfile.lock
index 646bb87..d4fb2c7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -63,7 +63,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (>= 3.8.5)
+  jekyll (= 4.0.0)
   jekyll-feed (~> 0.6)
   jekyll-sitemap
   tzinfo-data