diff --git a/remove-six.patch b/remove-six.patch
index f26073c..42a0862 100644
--- a/remove-six.patch
+++ b/remove-six.patch
@@ -10,20 +10,20 @@
  src/dateutil/parser/_parser.py            |   15 ++++------
  src/dateutil/parser/isoparser.py          |    5 +--
  src/dateutil/relativedelta.py             |    3 --
- src/dateutil/rrule.py                     |   42 +++++++++++++-----------------
+ src/dateutil/rrule.py                     |   43 +++++++++++++-----------------
  src/dateutil/tz/_common.py                |   15 ----------
- src/dateutil/tz/_factories.py             |    3 --
- src/dateutil/tz/tz.py                     |   18 ++++--------
+ src/dateutil/tz/_factories.py             |    4 --
+ src/dateutil/tz/tz.py                     |   19 ++++---------
  src/dateutil/tz/win.py                    |    8 ++---
  src/python_dateutil.egg-info/requires.txt |    1 
  tests/property/test_tz_prop.py            |    6 ----
  tests/test_imports.py                     |    9 +-----
- tests/test_isoparser.py                   |   17 ++----------
- tests/test_parser.py                      |   14 ++--------
- tests/test_rrule.py                       |   40 ----------------------------
+ tests/test_isoparser.py                   |   17 ++---------
+ tests/test_parser.py                      |   14 ++-------
+ tests/test_rrule.py                       |   40 ---------------------------
  tests/test_tz.py                          |    6 ----
  updatezinfo.py                            |    4 +-
- 24 files changed, 53 insertions(+), 166 deletions(-)
+ 24 files changed, 56 insertions(+), 166 deletions(-)
 
 --- a/.github/workflows/validate.yml
 +++ b/.github/workflows/validate.yml
@@ -218,7 +218,12 @@
                  self.weekday = weekday
 --- a/src/dateutil/rrule.py
 +++ b/src/dateutil/rrule.py
-@@ -15,10 +15,6 @@ from functools import wraps
+@@ -11,14 +11,11 @@ import heapq
+ import itertools
+ import re
+ import sys
++import _thread
+ from functools import wraps
  # For warning about deprecation of until and count
  from warnings import warn
  
@@ -229,7 +234,7 @@
  from ._common import weekday as weekdaybase
  
  try:
-@@ -134,7 +130,7 @@ class rrulebase(object):
+@@ -134,7 +131,7 @@ class rrulebase(object):
                      break
                  try:
                      for j in range(10):
@@ -238,7 +243,7 @@
                  except StopIteration:
                      self._cache_gen = gen = None
                      self._cache_complete = True
-@@ -161,7 +157,7 @@ class rrulebase(object):
+@@ -161,7 +158,7 @@ class rrulebase(object):
              gen = iter(self)
              try:
                  for i in range(item+1):
@@ -247,7 +252,7 @@
              except StopIteration:
                  raise IndexError
              return res
-@@ -479,14 +475,14 @@ class rrule(rrulebase):
+@@ -479,14 +476,14 @@ class rrule(rrulebase):
  
          if wkst is None:
              self._wkst = calendar.firstweekday()
@@ -264,7 +269,7 @@
              if bysetpos == 0 or not (-366 <= bysetpos <= 366):
                  raise ValueError("bysetpos must be between 1 and 366, "
                                   "or between -366 and -1")
-@@ -520,7 +516,7 @@ class rrule(rrulebase):
+@@ -520,7 +517,7 @@ class rrule(rrulebase):
          if bymonth is None:
              self._bymonth = None
          else:
@@ -273,7 +278,7 @@
                  bymonth = (bymonth,)
  
              self._bymonth = tuple(sorted(set(bymonth)))
-@@ -532,7 +528,7 @@ class rrule(rrulebase):
+@@ -532,7 +529,7 @@ class rrule(rrulebase):
          if byyearday is None:
              self._byyearday = None
          else:
@@ -282,7 +287,7 @@
                  byyearday = (byyearday,)
  
              self._byyearday = tuple(sorted(set(byyearday)))
-@@ -542,7 +538,7 @@ class rrule(rrulebase):
+@@ -542,7 +539,7 @@ class rrule(rrulebase):
          if byeaster is not None:
              if not easter:
                  from dateutil import easter
@@ -291,7 +296,7 @@
                  self._byeaster = (byeaster,)
              else:
                  self._byeaster = tuple(sorted(byeaster))
-@@ -556,7 +552,7 @@ class rrule(rrulebase):
+@@ -556,7 +553,7 @@ class rrule(rrulebase):
              self._bymonthday = ()
              self._bynmonthday = ()
          else:
@@ -300,7 +305,7 @@
                  bymonthday = (bymonthday,)
  
              bymonthday = set(bymonthday)            # Ensure it's unique
-@@ -573,7 +569,7 @@ class rrule(rrulebase):
+@@ -573,7 +570,7 @@ class rrule(rrulebase):
          if byweekno is None:
              self._byweekno = None
          else:
@@ -309,7 +314,7 @@
                  byweekno = (byweekno,)
  
              self._byweekno = tuple(sorted(set(byweekno)))
-@@ -588,13 +584,13 @@ class rrule(rrulebase):
+@@ -588,13 +585,13 @@ class rrule(rrulebase):
              # If it's one of the valid non-sequence types, convert to a
              # single-element sequence before the iterator that builds the
              # byweekday set.
@@ -325,7 +330,7 @@
                      self._byweekday.add(wday)
                  elif not wday.n or freq > MONTHLY:
                      self._byweekday.add(wday.weekday)
-@@ -629,7 +625,7 @@ class rrule(rrulebase):
+@@ -629,7 +626,7 @@ class rrule(rrulebase):
              else:
                  self._byhour = None
          else:
@@ -334,7 +339,7 @@
                  byhour = (byhour,)
  
              if freq == HOURLY:
-@@ -649,7 +645,7 @@ class rrule(rrulebase):
+@@ -649,7 +646,7 @@ class rrule(rrulebase):
              else:
                  self._byminute = None
          else:
@@ -343,7 +348,7 @@
                  byminute = (byminute,)
  
              if freq == MINUTELY:
-@@ -669,7 +665,7 @@ class rrule(rrulebase):
+@@ -669,7 +666,7 @@ class rrule(rrulebase):
              else:
                  self._bysecond = None
          else:
@@ -352,7 +357,7 @@
                  bysecond = (bysecond,)
  
              self._bysecond = set(bysecond)
-@@ -1062,7 +1058,7 @@ class rrule(rrulebase):
+@@ -1062,7 +1059,7 @@ class rrule(rrulebase):
          cset = set()
  
          # Support a single byxxx value.
@@ -361,7 +366,7 @@
              byxxx = (byxxx, )
  
          for num in byxxx:
-@@ -1315,7 +1311,7 @@ class rruleset(rrulebase):
+@@ -1315,7 +1312,7 @@ class rruleset(rrulebase):
      class _genitem(object):
          def __init__(self, genlist, gen):
              try:
@@ -370,7 +375,7 @@
                  genlist.append(self)
              except StopIteration:
                  pass
-@@ -1324,7 +1320,7 @@ class rruleset(rrulebase):
+@@ -1324,7 +1321,7 @@ class rruleset(rrulebase):
  
          def __next__(self):
              try:
@@ -379,7 +384,7 @@
              except StopIteration:
                  if self.genlist[0] is self:
                      heapq.heappop(self.genlist)
-@@ -1400,14 +1396,14 @@ class rruleset(rrulebase):
+@@ -1400,14 +1397,14 @@ class rruleset(rrulebase):
              if not lastdt or lastdt != ritem.dt:
                  while exlist and exlist[0] < ritem:
                      exitem = exlist[0]
@@ -426,7 +431,9 @@
  # The following is adapted from Alexander Belopolsky's tz library
 --- a/src/dateutil/tz/_factories.py
 +++ b/src/dateutil/tz/_factories.py
-@@ -2,9 +2,6 @@ from datetime import timedelta
+@@ -1,10 +1,8 @@
+ from datetime import timedelta
++import _thread
  import weakref
  from collections import OrderedDict
  
@@ -438,7 +445,11 @@
          cls.__instance = None
 --- a/src/dateutil/tz/tz.py
 +++ b/src/dateutil/tz/tz.py
-@@ -16,9 +16,6 @@ import bisect
+@@ -13,12 +13,10 @@ import time
+ import sys
+ import os
+ import bisect
++import _thread
  import weakref
  from collections import OrderedDict
  
@@ -448,7 +459,7 @@
  from ._common import tzname_in_python2, _tzinfo
  from ._common import tzrangebase, enfold
  from ._common import _validate_fromutc_inputs
-@@ -38,8 +35,7 @@ EPOCH = datetime.datetime(1970, 1, 1, 0,
+@@ -38,8 +36,7 @@ EPOCH = datetime.datetime(1970, 1, 1, 0,
  EPOCHORDINAL = EPOCH.toordinal()
  
  
@@ -458,7 +469,7 @@
      """
      This is a tzinfo object that represents the UTC time zone.
  
-@@ -129,8 +125,7 @@ class tzutc(datetime.tzinfo):
+@@ -129,8 +126,7 @@ class tzutc(datetime.tzinfo):
  UTC = tzutc()
  
  
@@ -468,7 +479,7 @@
      """
      A simple class for representing a fixed offset from UTC.
  
-@@ -459,7 +454,7 @@ class tzfile(_tzinfo):
+@@ -459,7 +455,7 @@ class tzfile(_tzinfo):
          super(tzfile, self).__init__()
  
          file_opened_here = False
@@ -477,7 +488,7 @@
              self._filename = fileobj
              fileobj = open(fileobj, 'rb')
              file_opened_here = True
-@@ -1033,8 +1028,7 @@ class tzrange(tzrangebase):
+@@ -1033,8 +1029,7 @@ class tzrange(tzrangebase):
          return self._dst_base_offset_
  
  
@@ -487,7 +498,7 @@
      """
      ``tzstr`` objects are time zone objects specified by a time-zone string as
      it would be passed to a ``TZ`` variable on POSIX-style systems (see
-@@ -1265,7 +1259,7 @@ class tzical(object):
+@@ -1265,7 +1260,7 @@ class tzical(object):
          global rrule
          from dateutil import rrule
  
@@ -496,7 +507,7 @@
              self._s = fileobj
              # ical should be encoded in UTF-8 with CRLF
              fileobj = open(fileobj, 'r')
-@@ -1621,7 +1615,7 @@ def __get_gettz():
+@@ -1621,7 +1616,7 @@ def __get_gettz():
                  except TypeError as e:
                      if isinstance(name, bytes):
                          new_msg = "gettz argument should be str, not bytes"