diff --git a/.cirrus.yml b/.cirrus.yml
index bcf1c5cc25..eb3d8c6717 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -108,7 +108,7 @@ iris_test_data_template: &IRIS_TEST_DATA_TEMPLATE
 #
 # Linting
 #
-lint_task:
+task:
   only_if: ${SKIP_LINT_TASK} == ""
   << : *CREDITS_TEMPLATE
   auto_cancellation: true
@@ -133,12 +133,10 @@ lint_task:
 #
 # Testing Minimal (Linux)
 #
-test_minimal_task:
+task:
   only_if: ${SKIP_TEST_MINIMAL_TASK} == "" && ${SKIP_ALL_TEST_TASKS} == ""
   << : *CREDITS_TEMPLATE
   matrix:
-    env:
-      PY_VER: 3.6
     env:
       PY_VER: 3.7
     env:
@@ -155,12 +153,10 @@ test_minimal_task:
 #
 # Testing Full (Linux)
 #
-test_full_task:
+task:
   only_if: ${SKIP_TEST_FULL_TASK} == "" && ${SKIP_ALL_TEST_TASKS} == ""
   << : *CREDITS_TEMPLATE
   matrix:
-    env:
-      PY_VER: 3.6
     env:
       PY_VER: 3.7
     env:
@@ -183,7 +179,7 @@ test_full_task:
 #
 # Testing Documentation Gallery (Linux)
 #
-gallery_task:
+task:
   only_if: ${SKIP_GALLERY_TASK} == "" && ${SKIP_ALL_DOC_TASKS} == ""
   << : *CREDITS_TEMPLATE
   env:
@@ -202,7 +198,7 @@ gallery_task:
 #
 # Testing Documentation (Linux)
 #
-doctest_task:
+task:
   only_if: ${SKIP_DOCTEST_TASK} == "" && ${SKIP_ALL_DOC_TASKS} == ""
   << : *CREDITS_TEMPLATE
   env:
@@ -226,7 +222,7 @@ doctest_task:
 #
 # Testing Documentation Link Check (Linux)
 #
-linkcheck_task:
+task:
   only_if: ${SKIP_LINKCHECK_TASK} == "" && ${SKIP_ALL_DOC_TASKS} == ""
   << : *CREDITS_TEMPLATE
   env:
diff --git a/docs/iris/src/whatsnew/3.0.4.rst b/docs/iris/src/whatsnew/3.0.4.rst
index fcb7dea17d..47a95a2ce5 100644
--- a/docs/iris/src/whatsnew/3.0.4.rst
+++ b/docs/iris/src/whatsnew/3.0.4.rst
@@ -1,7 +1,7 @@
 .. include:: ../common_links.inc
 
-v3.0.4 (?? ??August 2021)
-*************************
+v3.0.4 (22 July 2021)
+*********************
 
 This document explains the changes made to Iris for this release
 (:doc:`View all changes <index>`.)
@@ -22,7 +22,18 @@ This document explains the changes made to Iris for this release
       Firstly, ancillary-variables or cell-measures with long names can now widen the cube "dimensions map" to fit,
       whereas previously printing these cases caused an Exception.
       Secondly, cube units are now always printed, whereas previously they were missed out any time that the
-      "dimensions map" was widened to accomodate long coordinate names. (:pull:`4233`)
+      "dimensions map" was widened to accomodate long coordinate names.
+      (:pull:`4233`)(:pull:`4238`)
+
+   💼 **Internal**
+
+   #. `@bjlittle`_ Unpinned the `cftime`_ package dependency within Iris in order
+      to allow use of the latest versions of `cftime`_, `cf-units`_ and `nc-time-axis`_.
+      (:pull:`4222`)
+
+   Note that, we are forced to drop support for ``Python 3.6`` in this patch due to
+   the third-party package dependencies required by (:pull:`4222`).
+
 
 .. dropdown:: :opticon:`alert` v3.0.3 Patches
    :container: + shadow
@@ -600,3 +611,6 @@ This document explains the changes made to Iris for this release
 .. _travis-ci: https://travis-ci.org/github/SciTools/iris
 .. _stickler-ci: https://stickler-ci.com/
 .. _@jamesp: https://github.com/jamesp
+.. _cftime: https://github.com/Unidata/cftime
+.. _cf-units: https://github.com/SciTools/cf-units
+.. _nc-time-axis: https://github.com/SciTools/nc-time-axis
diff --git a/lib/iris/__init__.py b/lib/iris/__init__.py
index 490b033180..55ec9dd72a 100644
--- a/lib/iris/__init__.py
+++ b/lib/iris/__init__.py
@@ -106,7 +106,7 @@ def callback(cube, field, filename):
 
 
 # Iris revision.
-__version__ = "3.0.3"
+__version__ = "3.0.4"
 
 # Restrict the names imported when using "from iris import *"
 __all__ = [
diff --git a/lib/iris/fileformats/name_loaders.py b/lib/iris/fileformats/name_loaders.py
index ac9a2e35b2..9d08d5015f 100644
--- a/lib/iris/fileformats/name_loaders.py
+++ b/lib/iris/fileformats/name_loaders.py
@@ -480,7 +480,7 @@ def _generate_cubes(
                 coord_units = _parse_units("FL")
             if coord.name == "time":
                 coord_units = time_unit
-                pts = time_unit.date2num(coord.values)
+                pts = np.float_(time_unit.date2num(coord.values))
 
             if coord.dimension is not None:
                 if coord.name == "longitude":
@@ -507,7 +507,7 @@ def _generate_cubes(
                 ):
                     dt = coord.values - field_headings["Av or Int period"]
                     bnds = time_unit.date2num(np.vstack((dt, coord.values)).T)
-                    icoord.bounds = bnds
+                    icoord.bounds = np.float_(bnds)
                 else:
                     icoord.guess_bounds()
                 cube.add_dim_coord(icoord, coord.dimension)
@@ -524,7 +524,7 @@ def _generate_cubes(
                 ):
                     dt = coord.values - field_headings["Av or Int period"]
                     bnds = time_unit.date2num(np.vstack((dt, coord.values)).T)
-                    icoord.bounds = bnds[i, :]
+                    icoord.bounds = np.float_(bnds[i, :])
                 cube.add_aux_coord(icoord)
 
         # Headings/column headings which are encoded elsewhere.
@@ -1252,7 +1252,7 @@ def load_NAMEIII_trajectory(filename):
 
         long_name = units = None
         if isinstance(values[0], datetime.datetime):
-            values = time_unit.date2num(values)
+            values = np.float_(time_unit.date2num(values))
             units = time_unit
             if name == "Time":
                 name = "time"
diff --git a/lib/iris/fileformats/pp.py b/lib/iris/fileformats/pp.py
index 7589d27922..d40d12d90d 100644
--- a/lib/iris/fileformats/pp.py
+++ b/lib/iris/fileformats/pp.py
@@ -1476,8 +1476,18 @@ def t1(self):
 
         """
         if not hasattr(self, "_t1"):
+            has_year_zero = self.lbyr == 0
+            calendar = (
+                None if self.lbmon == 0 or self.lbdat == 0 else self.calendar
+            )
             self._t1 = cftime.datetime(
-                self.lbyr, self.lbmon, self.lbdat, self.lbhr, self.lbmin
+                self.lbyr,
+                self.lbmon,
+                self.lbdat,
+                self.lbhr,
+                self.lbmin,
+                calendar=calendar,
+                has_year_zero=has_year_zero,
             )
         return self._t1
 
@@ -1500,8 +1510,18 @@ def t2(self):
 
         """
         if not hasattr(self, "_t2"):
+            has_year_zero = self.lbyrd == 0
+            calendar = (
+                None if self.lbmond == 0 or self.lbdatd == 0 else self.calendar
+            )
             self._t2 = cftime.datetime(
-                self.lbyrd, self.lbmond, self.lbdatd, self.lbhrd, self.lbmind
+                self.lbyrd,
+                self.lbmond,
+                self.lbdatd,
+                self.lbhrd,
+                self.lbmind,
+                calendar=calendar,
+                has_year_zero=has_year_zero,
             )
         return self._t2
 
@@ -1537,6 +1557,10 @@ def t1(self):
 
         """
         if not hasattr(self, "_t1"):
+            has_year_zero = self.lbyr == 0
+            calendar = (
+                None if self.lbmon == 0 or self.lbdat == 0 else self.calendar
+            )
             self._t1 = cftime.datetime(
                 self.lbyr,
                 self.lbmon,
@@ -1544,6 +1568,8 @@ def t1(self):
                 self.lbhr,
                 self.lbmin,
                 self.lbsec,
+                calendar=calendar,
+                has_year_zero=has_year_zero,
             )
         return self._t1
 
@@ -1566,6 +1592,10 @@ def t2(self):
 
         """
         if not hasattr(self, "_t2"):
+            has_year_zero = self.lbyrd == 0
+            calendar = (
+                None if self.lbmond == 0 or self.lbdatd == 0 else self.calendar
+            )
             self._t2 = cftime.datetime(
                 self.lbyrd,
                 self.lbmond,
@@ -1573,6 +1603,8 @@ def t2(self):
                 self.lbhrd,
                 self.lbmind,
                 self.lbsecd,
+                calendar=calendar,
+                has_year_zero=has_year_zero,
             )
         return self._t2
 
diff --git a/lib/iris/fileformats/pp_save_rules.py b/lib/iris/fileformats/pp_save_rules.py
index cc17e8f87b..3b2cb2fa46 100644
--- a/lib/iris/fileformats/pp_save_rules.py
+++ b/lib/iris/fileformats/pp_save_rules.py
@@ -122,7 +122,7 @@ def _general_time_rules(cube, pp):
         pp.lbtim.ia = 0
         pp.lbtim.ib = 0
         pp.t1 = time_coord.units.num2date(time_coord.points[0])
-        pp.t2 = cftime.datetime(0, 0, 0)
+        pp.t2 = cftime.datetime(0, 0, 0, calendar=None, has_year_zero=True)
 
     # Forecast.
     if (
diff --git a/lib/iris/plot.py b/lib/iris/plot.py
index b0159af9d6..b9dc7241b4 100644
--- a/lib/iris/plot.py
+++ b/lib/iris/plot.py
@@ -604,7 +604,8 @@ def _fixup_dates(coord, values):
 
             r = [
                 nc_time_axis.CalendarDateTime(
-                    cftime.datetime(*date), coord.units.calendar
+                    cftime.datetime(*date, calendar=coord.units.calendar),
+                    coord.units.calendar,
                 )
                 for date in dates
             ]
diff --git a/lib/iris/tests/integration/plot/test_netcdftime.py b/lib/iris/tests/integration/plot/test_netcdftime.py
index 18ccd72a24..fc96d1febc 100644
--- a/lib/iris/tests/integration/plot/test_netcdftime.py
+++ b/lib/iris/tests/integration/plot/test_netcdftime.py
@@ -45,6 +45,7 @@ def test_360_day_calendar(self):
                 atime.hour,
                 atime.minute,
                 atime.second,
+                calendar=calendar,
             )
             for atime in times
         ]
diff --git a/lib/iris/tests/test_pp_module.py b/lib/iris/tests/test_pp_module.py
index 5c97460f5e..eb2d7e2d2c 100644
--- a/lib/iris/tests/test_pp_module.py
+++ b/lib/iris/tests/test_pp_module.py
@@ -154,9 +154,11 @@ def test_lbtim_access(self):
         self.assertEqual(self.r[0].lbtim.ic, 2)
 
     def test_t1_t2_access(self):
+        field = self.r[0]
+        calander = "360_day"
         self.assertEqual(
-            self.r[0].t1.timetuple(),
-            cftime.datetime(1994, 12, 1, 0, 0).timetuple(),
+            field.t1.timetuple(),
+            cftime.datetime(1994, 12, 1, 0, 0, calendar=calander).timetuple(),
         )
 
     def test_save_single(self):
diff --git a/lib/iris/tests/unit/fileformats/pp/test_save.py b/lib/iris/tests/unit/fileformats/pp/test_save.py
index 66f6246a0e..040b377def 100644
--- a/lib/iris/tests/unit/fileformats/pp/test_save.py
+++ b/lib/iris/tests/unit/fileformats/pp/test_save.py
@@ -240,7 +240,7 @@ def test_t2_time_mean(self):
 
     def test_t2_no_time_mean(self):
         cube = _get_single_time_cube(set_time_mean=False)
-        expected = cftime.datetime(0, 0, 0)
+        expected = cftime.datetime(0, 0, 0, calendar=None, has_year_zero=True)
 
         with mock.patch(
             "iris.fileformats.pp.PPField3", autospec=True
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_time_coords.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_time_coords.py
index f478d00bde..3ada8a770e 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_time_coords.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_time_coords.py
@@ -13,7 +13,7 @@
 # importing anything else.
 import iris.tests as tests
 
-from cf_units import Unit, CALENDAR_GREGORIAN
+from cf_units import Unit, CALENDAR_GREGORIAN, CALENDAR_360_DAY
 from cftime import datetime as nc_datetime
 import numpy as np
 import unittest
@@ -47,7 +47,9 @@ class TestLBTIMx0x_SingleTimepoint(TestField):
     def _check_timepoint(self, lbcode, expect_match=True):
         lbtim = _lbtim(ib=0, ic=1)
         t1 = nc_datetime(1970, 1, 1, hour=6, minute=0, second=0)
-        t2 = nc_datetime(0, 0, 0)  # not used in result
+        t2 = nc_datetime(
+            0, 0, 0, calendar=None, has_year_zero=True
+        )  # not used in result
         lbft = None  # unused
         coords_and_dims = _convert_time_coords(
             lbcode=lbcode,
@@ -296,8 +298,8 @@ def test_time_cross_section(self):
 class TestLBTIMx2x_ZeroYear(TestField):
     def test_(self):
         lbtim = _lbtim(ib=2, ic=1)
-        t1 = nc_datetime(0, 1, 1)
-        t2 = nc_datetime(0, 1, 31, 23, 59, 00)
+        t1 = nc_datetime(0, 1, 1, has_year_zero=True)
+        t2 = nc_datetime(0, 1, 31, 23, 59, 00, has_year_zero=True)
         lbft = 0
         lbcode = _lbcode(1)
         coords_and_dims = _convert_time_coords(
@@ -314,8 +316,8 @@ def test_(self):
 class TestLBTIMxxx_Unhandled(TestField):
     def test_unrecognised(self):
         lbtim = _lbtim(ib=4, ic=1)
-        t1 = nc_datetime(0, 0, 0)
-        t2 = nc_datetime(0, 0, 0)
+        t1 = nc_datetime(0, 0, 0, calendar=None, has_year_zero=True)
+        t2 = nc_datetime(0, 0, 0, calendar=None, has_year_zero=True)
         lbft = None
         lbcode = _lbcode(0)
         coords_and_dims = _convert_time_coords(
@@ -333,8 +335,13 @@ class TestLBCODE3xx(TestField):
     def test(self):
         lbcode = _lbcode(value=31323)
         lbtim = _lbtim(ib=2, ic=2)
-        t1 = nc_datetime(1970, 1, 3, hour=0, minute=0, second=0)
-        t2 = nc_datetime(1970, 1, 4, hour=0, minute=0, second=0)
+        calendar = CALENDAR_360_DAY
+        t1 = nc_datetime(
+            1970, 1, 3, hour=0, minute=0, second=0, calendar=calendar
+        )
+        t2 = nc_datetime(
+            1970, 1, 4, hour=0, minute=0, second=0, calendar=calendar
+        )
         lbft = 24 * 4
         coords_and_dims = _convert_time_coords(
             lbcode=lbcode,
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__epoch_date_hours.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__epoch_date_hours.py
index 0faa2478c5..195c5d8dc8 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__epoch_date_hours.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__epoch_date_hours.py
@@ -31,27 +31,28 @@
 
 class TestEpochHours__gregorian(tests.IrisTest):
     def setUp(self):
-        self.hrs_unit = Unit(
-            "hours since epoch", calendar=cf_units.CALENDAR_GREGORIAN
-        )
+        self.calendar = cf_units.CALENDAR_GREGORIAN
+        self.hrs_unit = Unit("hours since epoch", calendar=self.calendar)
 
     def test_1970_1_1(self):
-        test_date = nc_datetime(1970, 1, 1)
+        test_date = nc_datetime(1970, 1, 1, calendar=self.calendar)
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, 0.0)
 
     def test_ymd_1_1_1(self):
-        test_date = nc_datetime(1, 1, 1)
+        test_date = nc_datetime(1, 1, 1, calendar=self.calendar)
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, -17259936.0)
 
     def test_year_0(self):
-        test_date = nc_datetime(0, 1, 1)
+        test_date = nc_datetime(
+            0, 1, 1, calendar=self.calendar, has_year_zero=True
+        )
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, -17268720.0)
 
     def test_ymd_0_0_0(self):
-        test_date = nc_datetime(0, 0, 0)
+        test_date = nc_datetime(0, 0, 0, calendar=None, has_year_zero=True)
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, -17269488.0)
 
@@ -61,7 +62,15 @@ def test_ymd_0_preserves_timeofday(self):
             hrs + 1.0 / 60 * mins + 1.0 / 3600 * secs + (1.0e-6) / 3600 * usecs
         )
         test_date = nc_datetime(
-            0, 0, 0, hour=hrs, minute=mins, second=secs, microsecond=usecs
+            0,
+            0,
+            0,
+            hour=hrs,
+            minute=mins,
+            second=secs,
+            microsecond=usecs,
+            calendar=None,
+            has_year_zero=True,
         )
         result = epoch_hours_call(self.hrs_unit, test_date)
         # NOTE: the calculation is only accurate to approx +/- 0.5 seconds
@@ -74,66 +83,69 @@ def test_ymd_0_preserves_timeofday(self):
 
 class TestEpochHours__360day(tests.IrisTest):
     def setUp(self):
-        self.hrs_unit = Unit(
-            "hours since epoch", calendar=cf_units.CALENDAR_360_DAY
-        )
+        self.calendar = cf_units.CALENDAR_360_DAY
+        self.hrs_unit = Unit("hours since epoch", calendar=self.calendar)
 
     def test_1970_1_1(self):
-        test_date = nc_datetime(1970, 1, 1)
+        test_date = nc_datetime(1970, 1, 1, calendar=self.calendar)
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, 0.0)
 
     def test_ymd_1_1_1(self):
-        test_date = nc_datetime(1, 1, 1)
+        test_date = nc_datetime(1, 1, 1, calendar=self.calendar)
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, -17012160.0)
 
     def test_year_0(self):
-        test_date = nc_datetime(0, 1, 1)
+        test_date = nc_datetime(
+            0, 1, 1, calendar=self.calendar, has_year_zero=True
+        )
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, -17020800.0)
 
     def test_ymd_0_0_0(self):
-        test_date = nc_datetime(0, 0, 0)
+        test_date = nc_datetime(0, 0, 0, calendar=None, has_year_zero=True)
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, -17021544.0)
 
 
 class TestEpochHours__365day(tests.IrisTest):
     def setUp(self):
-        self.hrs_unit = Unit(
-            "hours since epoch", calendar=cf_units.CALENDAR_365_DAY
-        )
+        self.calendar = cf_units.CALENDAR_365_DAY
+        self.hrs_unit = Unit("hours since epoch", calendar=self.calendar)
 
     def test_1970_1_1(self):
-        test_date = nc_datetime(1970, 1, 1)
+        test_date = nc_datetime(1970, 1, 1, calendar=self.calendar)
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, 0.0)
 
     def test_ymd_1_1_1(self):
-        test_date = nc_datetime(1, 1, 1)
+        test_date = nc_datetime(1, 1, 1, calendar=self.calendar)
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, -17248440.0)
 
     def test_year_0(self):
-        test_date = nc_datetime(0, 1, 1)
+        test_date = nc_datetime(
+            0, 1, 1, calendar=self.calendar, has_year_zero=True
+        )
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, -17257200.0)
 
     def test_ymd_0_0_0(self):
-        test_date = nc_datetime(0, 0, 0)
+        test_date = nc_datetime(0, 0, 0, calendar=None, has_year_zero=True)
         result = epoch_hours_call(self.hrs_unit, test_date)
         self.assertEqual(result, -17257968.0)
 
 
 class TestEpochHours__invalid_calendar(tests.IrisTest):
     def test_bad_calendar(self):
+        self.calendar = cf_units.CALENDAR_ALL_LEAP
         # Setup a unit with an unrecognised calendar
-        hrs_unit = Unit(
-            "hours since epoch", calendar=cf_units.CALENDAR_ALL_LEAP
-        )
+        hrs_unit = Unit("hours since epoch", calendar=self.calendar)
         # Test against a date with year=0, which requires calendar correction.
-        test_date = nc_datetime(0, 1, 1)
+        test_date = nc_datetime(
+            0, 1, 1, calendar=self.calendar, has_year_zero=True
+        )
         # Check that this causes an error.
         with self.assertRaisesRegex(ValueError, "unrecognised calendar"):
             epoch_hours_call(hrs_unit, test_date)
diff --git a/lib/iris/tests/unit/plot/test__fixup_dates.py b/lib/iris/tests/unit/plot/test__fixup_dates.py
index 45ec53f760..53555614be 100644
--- a/lib/iris/tests/unit/plot/test__fixup_dates.py
+++ b/lib/iris/tests/unit/plot/test__fixup_dates.py
@@ -42,13 +42,14 @@ def test_gregorian_calendar_sub_second(self):
 
     @tests.skip_nc_time_axis
     def test_360_day_calendar(self):
-        unit = Unit("days since 2000-02-25 00:00:00", calendar="360_day")
+        calendar = "360_day"
+        unit = Unit("days since 2000-02-25 00:00:00", calendar=calendar)
         coord = AuxCoord([3, 4, 5], "time", units=unit)
         result = _fixup_dates(coord, coord.points)
         expected_datetimes = [
-            cftime.datetime(2000, 2, 28),
-            cftime.datetime(2000, 2, 29),
-            cftime.datetime(2000, 2, 30),
+            cftime.datetime(2000, 2, 28, calendar=calendar),
+            cftime.datetime(2000, 2, 29, calendar=calendar),
+            cftime.datetime(2000, 2, 30, calendar=calendar),
         ]
         self.assertArrayEqual(
             [cdt.datetime for cdt in result], expected_datetimes
@@ -56,13 +57,14 @@ def test_360_day_calendar(self):
 
     @tests.skip_nc_time_axis
     def test_365_day_calendar(self):
-        unit = Unit("minutes since 2000-02-25 00:00:00", calendar="365_day")
+        calendar = "365_day"
+        unit = Unit("minutes since 2000-02-25 00:00:00", calendar=calendar)
         coord = AuxCoord([30, 60, 150], "time", units=unit)
         result = _fixup_dates(coord, coord.points)
         expected_datetimes = [
-            cftime.datetime(2000, 2, 25, 0, 30),
-            cftime.datetime(2000, 2, 25, 1, 0),
-            cftime.datetime(2000, 2, 25, 2, 30),
+            cftime.datetime(2000, 2, 25, 0, 30, calendar=calendar),
+            cftime.datetime(2000, 2, 25, 1, 0, calendar=calendar),
+            cftime.datetime(2000, 2, 25, 2, 30, calendar=calendar),
         ]
         self.assertArrayEqual(
             [cdt.datetime for cdt in result], expected_datetimes
@@ -70,10 +72,11 @@ def test_365_day_calendar(self):
 
     @tests.skip_nc_time_axis
     def test_360_day_calendar_attribute(self):
-        unit = Unit("days since 2000-02-01 00:00:00", calendar="360_day")
+        calendar = "360_day"
+        unit = Unit("days since 2000-02-01 00:00:00", calendar=calendar)
         coord = AuxCoord([0, 3, 6], "time", units=unit)
         result = _fixup_dates(coord, coord.points)
-        self.assertEqual(result[0].calendar, "360_day")
+        self.assertEqual(result[0].calendar, calendar)
 
 
 if __name__ == "__main__":
diff --git a/noxfile.py b/noxfile.py
index 0a14732ec2..183b130221 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -20,7 +20,7 @@
 PACKAGE = str("lib" / Path("iris"))
 
 #: Cirrus-CI environment variable hook.
-PY_VER = os.environ.get("PY_VER", ["3.6", "3.7", "3.8"])
+PY_VER = os.environ.get("PY_VER", ["3.7", "3.8"])
 
 #: Default cartopy cache directory.
 CARTOPY_CACHE_DIR = os.environ.get("HOME") / Path(".local/share/cartopy")
diff --git a/requirements/ci/nox.lock/py36-linux-64.lock b/requirements/ci/nox.lock/py36-linux-64.lock
deleted file mode 100644
index eed8f05a9e..0000000000
--- a/requirements/ci/nox.lock/py36-linux-64.lock
+++ /dev/null
@@ -1,241 +0,0 @@
-# platform: linux-64
-# env_hash: 1a0a1f86b81c9babc7172b8741f714137a8e45bd758c8bd5a328f2051fbc4b62
-@EXPLICIT
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diff --git a/requirements/ci/nox.lock/py37-linux-64.lock b/requirements/ci/nox.lock/py37-linux-64.lock
index 5d4cd5b838..8573b4c349 100644
--- a/requirements/ci/nox.lock/py37-linux-64.lock
+++ b/requirements/ci/nox.lock/py37-linux-64.lock
@@ -1,17 +1,17 @@
 # platform: linux-64
-# env_hash: 9f683f7bd19228d6857db32d4372da95f0a29742d9ca4fa18f342162bbd8a667
+# env_hash: a797259192168ecaa234f8192b48737ad4f45b9e4ca752c2021e0bef05330a23
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
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+https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.5.30-ha878542_0.tar.bz2#6a777890e94194dc94a29a76d2a7e721
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+https://conda.anaconda.org/conda-forge/linux-64/mysql-common-8.0.25-ha770c72_2.tar.bz2#b1ba065c6d2b9468035472a9d63e5b08
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@@ -22,12 +22,15 @@ https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.3-h516909a_0.tar.bz
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+https://conda.anaconda.org/conda-forge/linux-64/fribidi-1.0.10-h36c2ea0_0.tar.bz2#ac7bc6a654f8f41b352b38f4051135f8
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@@ -36,23 +39,23 @@ https://conda.anaconda.org/conda-forge/linux-64/libogg-1.3.4-h7f98852_1.tar.bz2#
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+https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.32.1-h7f98852_1000.tar.bz2#772d69f030955d9646d3d0eaf21d859d
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diff --git a/requirements/ci/nox.lock/py38-linux-64.lock b/requirements/ci/nox.lock/py38-linux-64.lock
index 743342232a..060ddb0269 100644
--- a/requirements/ci/nox.lock/py38-linux-64.lock
+++ b/requirements/ci/nox.lock/py38-linux-64.lock
@@ -1,17 +1,17 @@
 # platform: linux-64
-# env_hash: 25d37d9c9841bf7d79d238578d4063a437222f0b5c8e90ee78623b3e38cf0b0b
+# env_hash: c5c986217942c161ca3ad267eea63cddcf1fe96ccac70478a37e0f626d4dd2fe
 @EXPLICIT
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 https://conda.anaconda.org/conda-forge/linux-64/setuptools-49.6.0-py38h578d9bd_3.tar.bz2#59c561cd1be0db9cf1c83f7d7cc74f4d
-https://conda.anaconda.org/conda-forge/linux-64/shapely-1.7.1-py38haeee4fe_4.tar.bz2#b94adbb3ce5a62a6894d7757005e6ad8
+https://conda.anaconda.org/conda-forge/linux-64/shapely-1.7.1-py38haeee4fe_5.tar.bz2#2e633d8e2257f3c0e465c858ce2ddbc6
 https://conda.anaconda.org/conda-forge/noarch/sphinxcontrib-napoleon-0.7-py_0.tar.bz2#0bc25ff6f2e34af63ded59692df5f749
 https://conda.anaconda.org/conda-forge/linux-64/asv-0.4.2-py38h709712a_2.tar.bz2#4659f315fc42e671606fbcd1b9234f75
 https://conda.anaconda.org/conda-forge/linux-64/bokeh-2.1.1-py38h32f6830_0.tar.bz2#896f192315a5a04c878febacd67e64cd
-https://conda.anaconda.org/conda-forge/linux-64/cf-units-2.1.5-py38hb5d20a5_0.tar.bz2#b45764dbfe02c18f80458bb241e37955
-https://conda.anaconda.org/conda-forge/linux-64/distributed-2021.5.0-py38h578d9bd_0.tar.bz2#4f32bf3fe6ff875d0afbaab19f3da3e9
+https://conda.anaconda.org/conda-forge/linux-64/cf-units-3.0.1-py38hb5d20a5_0.tar.bz2#8bca0164359fef4b52faa58b6921a7fa
+https://conda.anaconda.org/conda-forge/linux-64/distributed-2021.6.2-py38h578d9bd_0.tar.bz2#87cccb37c2a1e0ec30d3715431dee080
 https://conda.anaconda.org/conda-forge/linux-64/esmf-8.1.1-mpi_mpich_h3dcaa78_100.tar.bz2#5b4bab1017226f2c03ba0fe02b783316
 https://conda.anaconda.org/conda-forge/noarch/flake8-3.9.2-pyhd8ed1ab_0.tar.bz2#37d685abea0a25c921431edda02ad143
 https://conda.anaconda.org/conda-forge/linux-64/gtk2-2.24.33-h539f30e_1.tar.bz2#606777b4da3664d5c9415f5f165349fd
-https://conda.anaconda.org/conda-forge/noarch/identify-2.2.6-pyhd8ed1ab_0.tar.bz2#65bfce1f4233d5473b452989ed49a69a
+https://conda.anaconda.org/conda-forge/noarch/identify-2.2.10-pyhd8ed1ab_0.tar.bz2#1f9cd027f471e98e21d9740472b18096
 https://conda.anaconda.org/conda-forge/noarch/imagehash-4.2.0-pyhd8ed1ab_0.tar.bz2#e5a77472ae964f2835fce16355bbfe64
-https://conda.anaconda.org/conda-forge/linux-64/librsvg-2.50.5-hc3c00ef_0.tar.bz2#1362366116e80bcfbe9c7cd99766ea40
+https://conda.anaconda.org/conda-forge/linux-64/librsvg-2.50.7-hc3c00ef_0.tar.bz2#63fb96444e336b3d937921223dd9a481
 https://conda.anaconda.org/conda-forge/linux-64/matplotlib-base-3.4.2-py38hcc49a3a_0.tar.bz2#4bfb6818a1fce6d4129fdf121f788505
-https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.5.6-nompi_py38h5e9db54_103.tar.bz2#72a5656daeee23c80e22b936bef0ceb3
+https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.5.7-nompi_py38h5e9db54_100.tar.bz2#5f86dd7381e37db378068abd7707cd57
 https://conda.anaconda.org/conda-forge/noarch/nodeenv-1.6.0-pyhd8ed1ab_0.tar.bz2#0941325bf48969e2b3b19d0951740950
 https://conda.anaconda.org/conda-forge/linux-64/nose-1.3.7-py38h32f6830_1004.tar.bz2#c3f4d188368c26f373930da0171be824
-https://conda.anaconda.org/conda-forge/noarch/pip-21.1.2-pyhd8ed1ab_0.tar.bz2#dbd830edaffe5fc9ae6c1d425db2b5f2
+https://conda.anaconda.org/conda-forge/noarch/pip-21.1.3-pyhd8ed1ab_0.tar.bz2#231bd0af116f55ca4d17ea0869415fdf
 https://conda.anaconda.org/conda-forge/noarch/pygments-2.9.0-pyhd8ed1ab_0.tar.bz2#a2d9bba43c9b80a42b0ccb9afd7223c2
 https://conda.anaconda.org/conda-forge/noarch/pyopenssl-20.0.1-pyhd8ed1ab_0.tar.bz2#92371c25994d0f5d28a01c1fb75ebf86
 https://conda.anaconda.org/conda-forge/linux-64/pyqt-impl-5.12.3-py38h7400c14_7.tar.bz2#8fe28c949b01e3d69c2b357b5abf3916
 https://conda.anaconda.org/conda-forge/linux-64/cartopy-0.19.0.post1-py38hc9c980b_0.tar.bz2#65e97172e139d3465895eb07a1fd52f2
-https://conda.anaconda.org/conda-forge/noarch/dask-2021.5.0-pyhd8ed1ab_0.tar.bz2#dd5bcdcdc6c1f94f2a62c15fc6da65a3
+https://conda.anaconda.org/conda-forge/noarch/dask-2021.6.2-pyhd8ed1ab_0.tar.bz2#138fd8d4293eba5dcfe8448ec54f09f2
 https://conda.anaconda.org/conda-forge/linux-64/esmpy-8.1.1-mpi_mpich_py38h7f78e9f_100.tar.bz2#ce0ac0d6f5e6c5e7e0c613b08b3a0960
-https://conda.anaconda.org/conda-forge/linux-64/graphviz-2.47.1-h85b4f2f_1.tar.bz2#4b7c5657eac8ddfa0cae06f6f9a2a275
-https://conda.anaconda.org/conda-forge/noarch/nc-time-axis-1.2.0-py_1.tar.bz2#f3158a5d335f0f44f09cf05d3fb4107e
-https://conda.anaconda.org/conda-forge/linux-64/pre-commit-2.12.1-py38h578d9bd_0.tar.bz2#c26dbf85b3b8699f6a551e1f63bf9580
+https://conda.anaconda.org/conda-forge/linux-64/graphviz-2.47.3-h85b4f2f_0.tar.bz2#099cc43ac1c5bcce50318a9fc14a1d49
+https://conda.anaconda.org/conda-forge/noarch/nc-time-axis-1.3.1-pyhd8ed1ab_2.tar.bz2#d37916d7bf9519a3e3abb902a4c06b69
+https://conda.anaconda.org/conda-forge/linux-64/pre-commit-2.13.0-py38h578d9bd_0.tar.bz2#1013dff06f574377c64f11efa7e2c016
 https://conda.anaconda.org/conda-forge/linux-64/pyqtchart-5.12-py38h7400c14_7.tar.bz2#3003444b4f41742a33b7afdeb3260cbc
 https://conda.anaconda.org/conda-forge/linux-64/pyqtwebengine-5.12.1-py38h7400c14_7.tar.bz2#1c17944e118b314ff4d0bfc05f03a5e1
 https://conda.anaconda.org/conda-forge/noarch/pyugrid-0.3.1-py_2.tar.bz2#7d7361886fbcf2be663fd185bf6d244d
-https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.4-pyhd8ed1ab_0.tar.bz2#d7b20b328e23d993994ea02077c009c0
+https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.6-pyhd8ed1ab_0.tar.bz2#dea5b6d93cfbfbc2a253168ad05b3f89
 https://conda.anaconda.org/conda-forge/linux-64/pyqt-5.12.3-py38h578d9bd_7.tar.bz2#7166890c160d0441f59973a40b74f6e5
 https://conda.anaconda.org/conda-forge/noarch/requests-2.25.1-pyhd3deb0d_0.tar.bz2#ae687aba31a1c400192a86a2e993ffdc
 https://conda.anaconda.org/conda-forge/linux-64/matplotlib-3.4.2-py38h578d9bd_0.tar.bz2#82aa0479b2189ab97f9e70b90d7ec866
 https://conda.anaconda.org/conda-forge/noarch/sphinx-3.5.4-pyh44b312d_0.tar.bz2#0ebc444f001f73c4f6de01057b0be392
-https://conda.anaconda.org/conda-forge/noarch/sphinx-copybutton-0.3.1-pyhd8ed1ab_0.tar.bz2#decad13214a2a545944560eccf4a9815
+https://conda.anaconda.org/conda-forge/noarch/sphinx-copybutton-0.3.3-pyhd8ed1ab_0.tar.bz2#b066335fac136c776b7a441e35c1fcb2
 https://conda.anaconda.org/conda-forge/noarch/sphinx-gallery-0.9.0-pyhd8ed1ab_0.tar.bz2#5ef222a3e1b5904742e376e05046692b
 https://conda.anaconda.org/conda-forge/noarch/sphinx-panels-0.5.2-pyhd3deb0d_0.tar.bz2#1a871a63c4be1bd47a7aa48b7417a426
 https://conda.anaconda.org/conda-forge/noarch/sphinx_rtd_theme-0.5.2-pyhd8ed1ab_1.tar.bz2#7434e891fc767cb0d39d90751720c8ec
diff --git a/requirements/ci/py36.yml b/requirements/ci/py36.yml
deleted file mode 100644
index f778704803..0000000000
--- a/requirements/ci/py36.yml
+++ /dev/null
@@ -1,52 +0,0 @@
-name: iris-dev
-
-channels:
-  - conda-forge
-
-dependencies:
-  - python=3.6
-
-# Setup dependencies.
-  - setuptools>=40.8.0
-  - pyke
-
-# Core dependencies.
-  - cartopy>=0.18
-  - cf-units>=2
-  - cftime<1.3.0
-  - dask>=2
-  - matplotlib
-  - netcdf4
-  - numpy>=1.14
-  - python-xxhash
-  - scipy
-
-# Optional dependencies.
-  - esmpy>=7.0
-  - graphviz
-  - iris-sample-data
-  - mo_pack
-  - nc-time-axis
-  - pandas
-  - pip
-  - python-stratify
-  - pyugrid
-
-# Test dependencies.
-  - asv
-  - black=20.8b1
-  - filelock
-  - flake8
-  - imagehash>=4.0
-  - nose
-  - pillow<7
-  - pre-commit
-  - requests
-
-# Documentation dependencies.
-  - sphinx
-  - sphinxcontrib-napoleon
-  - sphinx-copybutton
-  - sphinx-gallery
-  - sphinx-panels
-  - sphinx_rtd_theme
diff --git a/requirements/ci/py37.yml b/requirements/ci/py37.yml
index 5b21e9f778..4032d6679a 100644
--- a/requirements/ci/py37.yml
+++ b/requirements/ci/py37.yml
@@ -4,25 +4,25 @@ channels:
   - conda-forge
 
 dependencies:
-  - python=3.7
+  - python =3.7
 
 # Setup dependencies.
-  - setuptools>=40.8.0
+  - setuptools >=40.8.0
   - pyke
 
 # Core dependencies.
-  - cartopy>=0.18
-  - cf-units>=2
-  - cftime<1.3.0
-  - dask>=2
+  - cartopy >=0.18
+  - cf-units
+  - cftime >=1.5
+  - dask >=2
   - matplotlib
   - netcdf4
-  - numpy>=1.14
+  - numpy >=1.14
   - python-xxhash
   - scipy
 
 # Optional dependencies.
-  - esmpy>=7.0
+  - esmpy >=7.0
   - graphviz
   - iris-sample-data
   - mo_pack
@@ -34,12 +34,12 @@ dependencies:
 
 # Test dependencies.
   - asv
-  - black=20.8b1
+  - black =20.8b1
   - filelock
   - flake8
-  - imagehash>=4.0
+  - imagehash >=4.0
   - nose
-  - pillow<7
+  - pillow <7
   - pre-commit
   - requests
 
diff --git a/requirements/ci/py38.yml b/requirements/ci/py38.yml
index e09a7a7164..99a2e15268 100644
--- a/requirements/ci/py38.yml
+++ b/requirements/ci/py38.yml
@@ -4,25 +4,25 @@ channels:
   - conda-forge
 
 dependencies:
-  - python=3.8
+  - python =3.8
 
 # Setup dependencies.
-  - setuptools>=40.8.0
+  - setuptools >=40.8.0
   - pyke
 
 # Core dependencies.
-  - cartopy>=0.18
-  - cf-units>=2
-  - cftime<1.3.0
-  - dask>=2
+  - cartopy >=0.18
+  - cf-units
+  - cftime >=1.5
+  - dask >=2
   - matplotlib
   - netcdf4
-  - numpy>=1.14
+  - numpy >=1.14
   - python-xxhash
   - scipy
 
 # Optional dependencies.
-  - esmpy>=7.0
+  - esmpy >=7.0
   - graphviz
   - iris-sample-data
   - mo_pack
@@ -34,12 +34,12 @@ dependencies:
 
 # Test dependencies.
   - asv
-  - black=20.8b1
+  - black =20.8b1
   - filelock
   - flake8
-  - imagehash>=4.0
+  - imagehash >=4.0
   - nose
-  - pillow<7
+  - pillow <7
   - pre-commit
   - requests
 
diff --git a/requirements/core.txt b/requirements/core.txt
index 9e0c4fb1bb..96411d50fb 100644
--- a/requirements/core.txt
+++ b/requirements/core.txt
@@ -1,8 +1,8 @@
 # Core dependencies.
 
 cartopy>=0.18
-cf-units>=2
-cftime<1.3.0
+cf-units
+cftime>=1.5
 dask[array]>=2
 matplotlib
 netcdf4
diff --git a/setup.py b/setup.py
index b1c8939fdd..40bcbfeca0 100644
--- a/setup.py
+++ b/setup.py
@@ -279,4 +279,5 @@ def long_description():
         "docs": pip_requirements("docs"),
         "test": pip_requirements("test"),
     },
+    python_requires=">=3.7",
 )