diff --git a/Gemfile b/Gemfile
index e3013c4..dd6254f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-gem "jekyll", ">=3.8.6"
+gem "jekyll", ">= 3.8.6", "< 5.0"
 
 # plugins
 group :jekyll_plugins do