diff -Nru bomstrip-9/debian/bomstrip.1 bomstrip-9/debian/bomstrip.1
--- bomstrip-9/debian/bomstrip.1	2020-05-02 11:59:23.000000000 +0000
+++ bomstrip-9/debian/bomstrip.1	2021-11-15 10:52:44.000000000 +0000
@@ -1,7 +1,7 @@
 .\" Written by Peter Pentchev in 2008.
 .\" This file is hereby placed into the public domain.
 .\"
-.Dd June 14, 2008
+.Dd November 14, 2021
 .Dt BOMSTRIP 1
 .Os
 .Sh NAME
@@ -78,6 +78,6 @@
 implementations in all languages.
 .Sh AUTHORS
 .An Mechiel Lukkien
-.Aq mechiel@xs4all.nl
+.Aq mechiel@ueber.net
 .An Peter Pentchev
 .Aq roam@ringlet.net
diff -Nru bomstrip-9/debian/changelog bomstrip-9/debian/changelog
--- bomstrip-9/debian/changelog	2020-05-02 11:59:23.000000000 +0000
+++ bomstrip-9/debian/changelog	2021-11-15 10:52:44.000000000 +0000
@@ -1,3 +1,14 @@
+bomstrip (9-15) unstable; urgency=medium
+
+  * Declare compliance with Debian Policy 4.6.0 with no changes.
+  * Explicitly specify dh-sequence-single-binary in the list of build
+    dependencies.
+  * Add the constify patch to mark some C/C++ variables as constant.
+  * Update the upstream author's e-mail address.
+  * Mark two patches as forwarded upstream.
+
+ -- Peter Pentchev <roam@debian.org>  Mon, 15 Nov 2021 12:52:44 +0200
+
 bomstrip (9-14) unstable; urgency=medium
 
   * Drop the adequate autopkgtest.
diff -Nru bomstrip-9/debian/control bomstrip-9/debian/control
--- bomstrip-9/debian/control	2020-05-02 11:59:23.000000000 +0000
+++ bomstrip-9/debian/control	2021-11-15 10:52:44.000000000 +0000
@@ -2,8 +2,10 @@
 Section: text
 Priority: optional
 Maintainer: Peter Pentchev <roam@debian.org>
-Build-Depends: debhelper-compat (= 13)
-Standards-Version: 4.5.0
+Build-Depends:
+  debhelper-compat (= 13),
+  dh-sequence-single-binary,
+Standards-Version: 4.6.0
 Homepage: https://www.ueber.net/who/mjl/projects/bomstrip/
 Vcs-Git: https://gitlab.com/ppentchev/bomstrip-pkg-debian.git
 Vcs-Browser: https://gitlab.com/ppentchev/bomstrip-pkg-debian
diff -Nru bomstrip-9/debian/copyright bomstrip-9/debian/copyright
--- bomstrip-9/debian/copyright	2020-05-02 11:59:23.000000000 +0000
+++ bomstrip-9/debian/copyright	2021-11-15 10:52:44.000000000 +0000
@@ -1,6 +1,6 @@
 Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: bomstrip
-Upstream-Contact: Mechiel Lukkien <mechiel@xs4all.nl>
+Upstream-Contact: Mechiel Lukkien <mechiel@ueber.net>
 Source: https://www.ueber.net/who/mjl/projects/bomstrip/
 License: public-domain
 
diff -Nru bomstrip-9/debian/patches/constify.patch bomstrip-9/debian/patches/constify.patch
--- bomstrip-9/debian/patches/constify.patch	1970-01-01 00:00:00.000000000 +0000
+++ bomstrip-9/debian/patches/constify.patch	2021-11-15 10:52:44.000000000 +0000
@@ -0,0 +1,66 @@
+Description: Mark some C and C++ variables as constant.
+Author: Peter Pentchev <roam@ringlet.net>
+Forwarded: yes
+Last-Update: 2021-11-14
+
+--- a/bomstrip.c
++++ b/bomstrip.c
+@@ -4,19 +4,19 @@
+ #include <string.h>
+ 
+ char		 buf[BUFSIZ];
+-const char	*utf8bom = "\xef\xbb\xbf";
++const char	* const utf8bom = "\xef\xbb\xbf";
+ 
+ static void	 usage(const char *);
+ 
+ static void
+-usage(const char *prog)
++usage(const char * const prog)
+ {
+ 	fprintf(stderr, "usage: %s\n", prog);
+ 	exit(1);
+ }
+ 
+ int
+-main(int argc, const char * const argv[])
++main(const int argc, const char * const argv[])
+ {
+ 	size_t nread;
+ 
+--- a/bomstrip.cpp
++++ b/bomstrip.cpp
+@@ -6,20 +6,20 @@
+ 
+ using namespace std;
+ 
+-const char	*utf8bom = "\xef\xbb\xbf";
++const char	* const utf8bom = "\xef\xbb\xbf";
+ 
+ static void	 usage(const char *);
+-static void	 outendl(string &);
++static void	 outendl(const string &);
+ 
+ static void
+-usage(const char *prog)
++usage(const char * const prog)
+ {
+ 	cerr << "usage: " << prog << endl;
+ 	exit(1);
+ }
+ 
+ static void
+-outendl(string &s)
++outendl(const string &s)
+ {
+ 	cout << s;
+ 	if (!cin.eof())
+@@ -27,7 +27,7 @@
+ }
+ 
+ int
+-main(int argc, const char * const argv[])
++main(const int argc, const char * const argv[])
+ {
+ 	string s;
+ 
diff -Nru bomstrip-9/debian/patches/series bomstrip-9/debian/patches/series
--- bomstrip-9/debian/patches/series	2020-05-02 11:59:23.000000000 +0000
+++ bomstrip-9/debian/patches/series	2021-11-15 10:52:44.000000000 +0000
@@ -1,2 +1,3 @@
 c-warnings.patch
 typos.patch
+constify.patch
diff -Nru bomstrip-9/debian/patches/typos.patch bomstrip-9/debian/patches/typos.patch
--- bomstrip-9/debian/patches/typos.patch	2020-05-02 11:59:23.000000000 +0000
+++ bomstrip-9/debian/patches/typos.patch	2021-11-15 10:52:44.000000000 +0000
@@ -1,5 +1,5 @@
 Description: Correct a typographical error.
-Forwarded: no
+Forwarded: yes
 Author: Peter Pentchev <roam@ringlet.net>
 Last-Update: 2017-01-09