diff --git a/debian/patches/001.doctests-compatible-py2and3.patch b/debian/patches/001.doctests-compatible-py2and3.patch
deleted file mode 100644
index dab416c..0000000
--- a/debian/patches/001.doctests-compatible-py2and3.patch
+++ /dev/null
@@ -1,86 +0,0 @@
-From: Ben Finney <bignose@debian.org>
-Date: Sat, 14 May 2022 02:47:49 +0800
-Subject: Make doctest examples compatible with Python 2 and Python 3.
-
-Existing doctests were written only for Python 2 and have not yet
-been updated upstream to work with Python 3.
-Last-Update: 2015-05-16
----
- doc/source/index.rst |  6 +++---
- lockfile/__init__.py | 16 ++++++++--------
- 2 files changed, 11 insertions(+), 11 deletions(-)
-
-diff --git a/doc/source/index.rst b/doc/source/index.rst
-index 5f1f2dd..ac1ba50 100644
---- a/doc/source/index.rst
-+++ b/doc/source/index.rst
-@@ -231,14 +231,14 @@ This example is the "hello world" for the :mod:`lockfile` package::
-     from lockfile import LockFile
-     lock = LockFile("/some/file/or/other")
-     with lock:
--        print lock.path, 'is locked.'
-+        print(lock.path, "is locked.")
- 
- To use this with Python 2.4, you can execute::
- 
-     from lockfile import LockFile
-     lock = LockFile("/some/file/or/other")
-     lock.acquire()
--    print lock.path, 'is locked.'
-+    print(lock.path, "is locked.")
-     lock.release()
- 
- If you don't want to wait forever, you might try::
-@@ -251,7 +251,7 @@ If you don't want to wait forever, you might try::
- 	except LockTimeout:
- 	    lock.break_lock()
- 	    lock.acquire()
--    print "I locked", lock.path
-+    print("I locked", lock.path)
-     lock.release()
- 
- You can also insure that a lock is always held when appropriately decorated
-diff --git a/lockfile/__init__.py b/lockfile/__init__.py
-index a6f44a5..d4b1436 100644
---- a/lockfile/__init__.py
-+++ b/lockfile/__init__.py
-@@ -12,23 +12,23 @@ Usage:
- >>> try:
- ...     lock.acquire()
- ... except AlreadyLocked:
--...     print 'somefile', 'is locked already.'
-+...     print('somefile', "is locked already.")
- ... except LockFailed:
--...     print 'somefile', 'can\\'t be locked.'
-+...     print('somefile', "can't be locked.")
- ... else:
--...     print 'got lock'
-+...     print("got lock")
- got lock
-->>> print lock.is_locked()
-+>>> lock.is_locked()
- True
- >>> lock.release()
- 
- >>> lock = LockFile('somefile')
-->>> print lock.is_locked()
-+>>> lock.is_locked()
- False
- >>> with lock:
--...    print lock.is_locked()
-+...    lock.is_locked()
- True
-->>> print lock.is_locked()
-+>>> lock.is_locked()
- False
- 
- >>> lock = LockFile('somefile')
-@@ -37,7 +37,7 @@ False
- ...     lock.acquire()
- ...
- >>> # Though no counter is kept, so you can't unlock multiple times...
-->>> print lock.is_locked()
-+>>> lock.is_locked()
- False
- 
- Exceptions:
diff --git a/debian/patches/series b/debian/patches/series
deleted file mode 100644
index ebdfb9e..0000000
--- a/debian/patches/series
+++ /dev/null
@@ -1 +0,0 @@
-001.doctests-compatible-py2and3.patch
diff --git a/debian/source/format b/debian/source/format
index 163aaf8..89ae9db 100644
--- a/debian/source/format
+++ b/debian/source/format
@@ -1 +1 @@
-3.0 (quilt)
+3.0 (native)