diff --git a/Gemfile b/Gemfile
index 61920ab..7067b70 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ gem "posix-spawn", :platforms => :ruby
 gem "redcarpet", :platforms => :ruby
 gem "kramdown", :platforms => :jruby
 gem "RedCloth"
-gem "commonmarker", "~> 0.18.1"
+gem "commonmarker", git: "https://github.com/gjtorikian/commonmarker.git", tag: "v0.18.3"
 gem "rdoc", "~>3.6"
 gem "org-ruby", "= 0.9.9"
 gem "creole", "~>0.3.6"
diff --git a/HISTORY.md b/HISTORY.md
index c296602..966ef18 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,6 @@
+## 4.0.1 - 2022-03-07
+* Update to commonmarker 0.23.4; See [Version Changelog](https://github.com/gjtorikian/commonmarker/blob/main/CHANGELOG.md#v0234-2022-03-03)
+
 ## 4.0.0 - 2021-03-31
 
 * Drop support for Python 2 in RST rendering [#1456](https://github.com/github/markup/pull/1456)
diff --git a/lib/github-markup.rb b/lib/github-markup.rb
index df6aa41..0244f15 100644
--- a/lib/github-markup.rb
+++ b/lib/github-markup.rb
@@ -1,6 +1,6 @@
 module GitHub
   module Markup
-    VERSION = '4.0.0'
+    VERSION = '4.0.1'
     Version = VERSION
   end
 end