diff --git a/Gemfile b/Gemfile
index ff2506d..ac640f8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem "github-markup", "3.0.4"
+gem "github-markup", "4.0.0"
 gem "RedCloth", "=4.3.2"
 gem "asciidoctor", "2.0.16"
 gem "commonmarker", "=0.21.0"