diff --git a/Gemfile b/Gemfile
index e87f608..397eacd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
 source 'https://rubygems.org'
 ruby "2.4.0"
 
-gem "jekyll"
+gem "jekyll", ">= 3.9.0"