diff --git a/rubygem-crack-0.4.5-Use-named-parameters-for-safe_load.patch b/rubygem-crack-0.4.5-Use-named-parameters-for-safe_load.patch
new file mode 100644
index 0000000..de91629
--- /dev/null
+++ b/rubygem-crack-0.4.5-Use-named-parameters-for-safe_load.patch
@@ -0,0 +1,33 @@
+From 7fa8d8aea4a041969e433debef7f4d5d59881ae2 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?V=C3=ADt=20Ondruch?= <vondruch@redhat.com>
+Date: Fri, 11 Mar 2022 18:29:43 +0100
+Subject: [PATCH] Use named parameters for `safe_load`.
+
+This is available since Psych 3.1 [[1], [2]], but mandatory since Psych
+4.0 [[3]].
+
+Fixes #72
+
+[1]: https://github.com/ruby/psych/pull/358
+[2]: https://github.com/ruby/psych/pull/378
+[3]: https://github.com/ruby/psych/commit/0767227051dbddf1f949eef512c174deabf22891
+---
+ lib/crack/json.rb | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/crack/json.rb b/lib/crack/json.rb
+index 1a27ac7..528aad6 100644
+--- a/lib/crack/json.rb
++++ b/lib/crack/json.rb
+@@ -13,7 +13,7 @@ module Crack
+ 
+     def self.parse(json)
+       yaml = unescape(convert_json_to_yaml(json))
+-      YAML.safe_load(yaml, [Regexp, Date, Time])
++      YAML.safe_load(yaml, permitted_classes: [Regexp, Date, Time])
+     rescue *parser_exceptions
+       raise ParseError, "Invalid JSON string"
+     rescue Psych::DisallowedClass
+-- 
+2.34.1
+
diff --git a/rubygem-crack.spec b/rubygem-crack.spec
index c1bdf31..0bcfc76 100644
--- a/rubygem-crack.spec
+++ b/rubygem-crack.spec
@@ -2,7 +2,7 @@
 
 Name: rubygem-%{gem_name}
 Version: 0.4.5
-Release: 4%{?dist}
+Release: 5%{?dist}
 Summary: Really simple JSON and XML parsing, ripped from Merb and Rails
 License: MIT
 URL: https://github.com/jnunemaker/crack
@@ -10,6 +10,9 @@ Source0: https://rubygems.org/gems/%{gem_name}-%{version}.gem
 # git clone https://github.com/jnunemaker/crack.git && cd crack
 # git archive -v -o crack-0.4.5-tests.tar.gz a951228b1ec0d19c8e3100f92b83a07b24c57a99 test/
 Source1: crack-%{version}-tests.tar.gz
+# Fix Ruby 3.1 / Psych 4.0 compatibility.
+# https://github.com/jnunemaker/crack/pull/73
+Patch0: rubygem-crack-0.4.5-Use-named-parameters-for-safe_load.patch
 # ruby package has just soft dependency on rubygem(bigdecimal), while
 # crack always requires it.
 Requires: rubygem(bigdecimal)
@@ -37,6 +40,8 @@ Documentation for %{name}.
 %prep
 %setup -q -n %{gem_name}-%{version} -b 1
 
+%patch0 -p1
+
 %build
 # Create the gem as gem install only works on a gem file
 gem build ../%{gem_name}-%{version}.gemspec
@@ -70,6 +75,9 @@ popd
 
 
 %changelog
+* Fri Mar 11 2022 Vít Ondruch <vondruch@redhat.com> - 1:0.4.5-5
+- Fix Ruby 3.1 / Psych 4.0 compatibility.
+
 * Fri Jan 21 2022 Fedora Release Engineering <releng@fedoraproject.org> - 1:0.4.5-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild