diff --git a/0003-support-ruby33-Logger.patch b/0003-support-ruby33-Logger.patch
new file mode 100644
index 0000000..eadf945
--- /dev/null
+++ b/0003-support-ruby33-Logger.patch
@@ -0,0 +1,39 @@
+From 4c93df1eeff84463c6fc299b62b78c20c3163a09 Mon Sep 17 00:00:00 2001
+From: Mamoru TASAKA <mtasaka@fedoraproject.org>
+Date: Fri, 29 Sep 2023 15:00:12 +0900
+Subject: [PATCH] Support ruby3.3 Logger by properly initialize super class
+
+Upcoming ruby3.3 will have enhanced Logger class:
+https://github.com/ruby/ruby/commit/194520f80e1cdb71faa055d731450855a1ddb8d1
+which initializes newly added instance variables.
+Without initializing such variables (in super class), now using
+subclass of Logger will cause exception.
+
+To avoid this, first call super, then execute additional subclass
+initialization.
+
+Closes #4493 .
+---
+ lib/asciidoctor/logging.rb | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/lib/asciidoctor/logging.rb b/lib/asciidoctor/logging.rb
+index 7664c7e75d..1f846c4fba 100644
+--- a/lib/asciidoctor/logging.rb
++++ b/lib/asciidoctor/logging.rb
+@@ -42,6 +42,7 @@ class MemoryLogger < ::Logger
+   attr_reader :messages
+ 
+   def initialize
++    super nil
+     self.level = WARN
+     @messages = []
+   end
+@@ -69,6 +70,7 @@ class NullLogger < ::Logger
+   attr_reader :max_severity
+ 
+   def initialize
++    super nil
+     self.level = WARN
+   end
+ 
diff --git a/rubygem-asciidoctor.spec b/rubygem-asciidoctor.spec
index 5f43a8b..e596361 100644
--- a/rubygem-asciidoctor.spec
+++ b/rubygem-asciidoctor.spec
@@ -7,7 +7,7 @@
 Summary: A fast, open source AsciiDoc implementation in Ruby
 Name: rubygem-%{gem_name}
 Version: 2.0.20
-Release: 3%{?dist}
+Release: 4%{?dist}
 License: MIT
 URL: https://asciidoctor.org
 Source0: https://github.com/asciidoctor/asciidoctor/archive/%{gittag}/%{gem_name}-%{version}%{pre}.tar.gz
@@ -17,6 +17,8 @@ Source0: https://github.com/asciidoctor/asciidoctor/archive/%{gittag}/%{gem_name
 Patch0: 0001-use-single-line-block-in-manify-method-in-manpage-co.patch
 # https://github.com/asciidoctor/asciidoctor/commit/b7c03964
 Patch1: 0002-change-dot-layout-in-chained-method-call-to-be-compa.patch
+# https://github.com/asciidoctor/asciidoctor/pull/4494
+Patch2: 0003-support-ruby33-Logger.patch
 %if 0%{?el7}
 Requires: ruby(release)
 BuildRequires: ruby(release)
@@ -127,6 +129,9 @@ cp -a .%{gem_instdir}/man/*.1 \
 %doc %{gem_docdir}
 
 %changelog
+* Fri Sep 29 2023 Mamoru TASAKA <mtasaka@fedoraproject.org> - 2.0.20-4
+- Apply the upstream PR to support ruby 3.3 Logger
+
 * Fri Jul 21 2023 Fedora Release Engineering <releng@fedoraproject.org> - 2.0.20-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild