diff --git a/sgml-skel.changes b/sgml-skel.changes
index 24075a2..9d8ca6b 100644
--- a/sgml-skel.changes
+++ b/sgml-skel.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu May 27 11:41:23 UTC 2021 - Antonio Larrosa <alarrosa@suse.com>
+
+- %post uses sed, so add `Requires(post): sed`.
+
 -------------------------------------------------------------------
 Tue Jan 31 17:47:56 UTC 2017 - mpluskal@suse.com
 
diff --git a/sgml-skel.spec b/sgml-skel.spec
index 1085620..410f333 100644
--- a/sgml-skel.spec
+++ b/sgml-skel.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package sgml-skel
 #
-# Copyright (c) 2017 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2021 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -12,7 +12,7 @@
 # license that conforms to the Open Source Definition (Version 1.9)
 # published by the Open Source Initiative.
 
-# Please submit bugfixes or comments via http://bugs.opensuse.org/
+# Please submit bugfixes or comments via https://bugs.opensuse.org/
 #
 
 
@@ -20,9 +20,9 @@ Name:           sgml-skel
 Version:        0.7.1
 Release:        0
 Summary:        Helper Scripts for the SGML System
-License:        GPL-2.0+
+License:        GPL-2.0-or-later
 Group:          Productivity/Publishing/SGML
-Url:            https://github.com/openSUSE/sgml-skel
+URL:            https://github.com/openSUSE/sgml-skel
 Source0:        https://github.com/openSUSE/sgml-skel/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 BuildRequires:  automake
 BuildRequires:  libxml2
@@ -38,6 +38,7 @@ Requires(post): coreutils
 Requires(post): findutils
 Requires(post): libxml2-tools
 Requires(post): libxslt-tools
+Requires(post): sed
 BuildArch:      noarch
 
 %description