diff --git a/ruby-irb-1.4.1-drop-rdoc-hard-dep.patch b/ruby-irb-1.4.1-drop-rdoc-hard-dep.patch
new file mode 100644
index 0000000..711c514
--- /dev/null
+++ b/ruby-irb-1.4.1-drop-rdoc-hard-dep.patch
@@ -0,0 +1,24 @@
+From 54c8df06ff9e161012f89d19a4e3aa2e0e37e1b0 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?V=C3=ADt=20Ondruch?= <vondruch@redhat.com>
+Date: Tue, 23 Aug 2022 10:41:28 +0200
+Subject: [PATCH] Drop hard dependency on RDoc.
+
+This has been introduced in 026700499dfd640b2072d7bf0370247a98d5ac40,
+but it seems that this is just be mistake, otherwise the later handling
+of `LoadError` would not be needed.
+---
+ lib/irb/input-method.rb | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
+index fd68239e..a8227caa 100644
+--- a/lib/irb/input-method.rb
++++ b/lib/irb/input-method.rb
+@@ -14,7 +14,6 @@
+ require_relative 'completion'
+ require 'io/console'
+ require 'reline'
+-require 'rdoc'
+ 
+ module IRB
+   STDIN_FILE_NAME = "(line)" # :nodoc:
diff --git a/ruby-irb-1.4.1-set-rdoc-soft-dep.patch b/ruby-irb-1.4.1-set-rdoc-soft-dep.patch
new file mode 100644
index 0000000..0156fe0
--- /dev/null
+++ b/ruby-irb-1.4.1-set-rdoc-soft-dep.patch
@@ -0,0 +1,41 @@
+From b24852058fc87c940252c8a711c60ae2eb298082 Mon Sep 17 00:00:00 2001
+From: Jun Aruga <jaruga@redhat.com>
+Date: Thu, 25 Aug 2022 20:11:34 +0200
+Subject: [PATCH] Require RDoc in `input-method.rb` again in a limited scope.
+
+RDoc is implemented as soft dependency in IRB. See how the rdoc is required in
+the files. I reverted the commit below.
+
+```
+$ grep -ril rdoc lib/
+lib/irb/cmd/help.rb
+lib/irb/completion.rb
+lib/irb/easter-egg.rb
+lib/irb/input-method.rb
+```
+
+---
+
+Revert "Remove `require` in signal handler to avoid ThreadError"
+
+This reverts commit 5f749c613c895cf1b11b5e4cbd1205363bc58028.
+---
+ lib/irb/input-method.rb | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
+index a8227ca..b77fd32 100644
+--- a/lib/irb/input-method.rb
++++ b/lib/irb/input-method.rb
+@@ -320,6 +320,11 @@ def auto_indent(&block)
+         [195, 164], # The "ä" that appears when Alt+d is pressed on xterm.
+         [226, 136, 130] # The "∂" that appears when Alt+d in pressed on iTerm2.
+       ]
++      begin
++        require 'rdoc'
++      rescue LoadError
++        return nil
++      end
+ 
+       if just_cursor_moving and completion_journey_data.nil?
+         return nil
diff --git a/ruby.spec b/ruby.spec
index 3de20eb..e2429ac 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -202,6 +202,12 @@ Patch25: ruby-rubygems-3.3.8-Resolve-cleaned-up-error-with-temporary-gemhome.pat
 # Fix tests with Europe/Amsterdam pre-1970 time on tzdata version 2022b.
 # https://github.com/ruby/spec/pull/939
 Patch26: ruby-spec-Fix-tests-on-tzdata-2022b.patch
+# Drop hard dependency on RDoc in IRB.
+# https://github.com/ruby/irb/pull/393
+Patch27: ruby-irb-1.4.1-drop-rdoc-hard-dep.patch
+# Set soft dependency on RDoc in input-method.rb in IRB.
+# https://github.com/ruby/irb/pull/395
+Patch28: ruby-irb-1.4.1-set-rdoc-soft-dep.patch
 
 Requires: %{name}-libs%{?_isa} = %{version}-%{release}
 Suggests: rubypick
@@ -354,6 +360,7 @@ Requires:   ruby(rubygems) >= %{rubygems_version}
 # ruby-default-gems is required to run irb.
 # https://bugs.ruby-lang.org/issues/16951
 Requires:   ruby-default-gems >= %{ruby_version}
+Recommends: rubygem(rdoc) >= %{rdoc_version}
 Provides:   irb = %{version}-%{release}
 Provides:   rubygem(irb) = %{version}-%{release}
 # Obsoleted by Ruby 2.6 in F30 timeframe.
@@ -679,6 +686,8 @@ find .bundle/gems -name '*-[0-9]*.gemspec' -exec cp -t .bundle/specifications/ {
 %patch24 -p1
 %patch25 -p1
 %patch26 -p1
+%patch27 -p1
+%patch28 -p1
 
 # Provide an example of usage of the tapset:
 cp -a %{SOURCE3} .
@@ -1535,6 +1544,10 @@ mv test/fiddle/test_import.rb{,.disable}
 
 
 %changelog
+* Mon Aug 29 2022 Jun Aruga <jaruga@redhat.com> - 3.1.2-168
+- Make RDoc soft dependnecy in IRB.
+  Resolves: rhbz#2119964
+
 * Wed Aug 24 2022 Jun Aruga <jaruga@redhat.com> - 3.1.2-168
 - Fix tests with Europe/Amsterdam pre-1970 time on tzdata version 2022b.
   Resolves: rhbz#2120354