diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 82ceaa2..4b49657 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -15,6 +15,10 @@ Unreleased
 ~~~~~~~~~~
 *
 
+[1.0.0] - 2021-01-21
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+* Dropped python3.5 support.
+
 [0.5.4] - 2020-12-10
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Upgrade celery to 5.0.4
diff --git a/celery_utils/__init__.py b/celery_utils/__init__.py
index 52eeb67..652cdd8 100644
--- a/celery_utils/__init__.py
+++ b/celery_utils/__init__.py
@@ -2,6 +2,6 @@
 Code to support working with celery.
 """
 
-__version__ = '0.5.7'
+__version__ = '1.0.0'
 
 default_app_config = 'celery_utils.apps.CeleryUtilsConfig'  # pylint: disable=invalid-name
diff --git a/celery_utils/apps.py b/celery_utils/apps.py
index 7db118d..3b50beb 100644
--- a/celery_utils/apps.py
+++ b/celery_utils/apps.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 celery_utils Django application initialization.
 """
diff --git a/celery_utils/management/commands/cleanup_resolved_tasks.py b/celery_utils/management/commands/cleanup_resolved_tasks.py
index f5262c6..dea9108 100644
--- a/celery_utils/management/commands/cleanup_resolved_tasks.py
+++ b/celery_utils/management/commands/cleanup_resolved_tasks.py
@@ -36,13 +36,13 @@ def add_arguments(self, parser):
         parser.add_argument(
             '--task-name', '-t',
             default=None,
-            help=u"Restrict cleanup to tasks matching the named task.",
+            help="Restrict cleanup to tasks matching the named task.",
         )
         parser.add_argument(
             '--age', '-a',
             type=int,
             default=30,
-            help=u"Only delete tasks that have been resolved for at least the specified number of days (default: 30)",
+            help="Only delete tasks that have been resolved for at least the specified number of days (default: 30)",
         )
 
     def handle(self, *args, **options):
diff --git a/celery_utils/management/commands/tests/test_reapply_tasks.py b/celery_utils/management/commands/tests/test_reapply_tasks.py
index ac447f4..d2d64e4 100644
--- a/celery_utils/management/commands/tests/test_reapply_tasks.py
+++ b/celery_utils/management/commands/tests/test_reapply_tasks.py
@@ -4,8 +4,8 @@
 
 from collections import Counter
 from datetime import datetime
+from unittest import mock
 
-import mock
 import pytest
 
 from django.core.management import call_command
@@ -28,24 +28,24 @@ def failed_tasks():
     return [
         models.FailedTask.objects.create(
             task_name=tasks.fallible_task.name,
-            task_id=u'fail_again',
+            task_id='fail_again',
             args=[],
             kwargs={"error_message": "Err, yo!"},
-            exc=u'UhOhError().',
+            exc='UhOhError().',
         ),
         models.FailedTask.objects.create(
             task_name=tasks.fallible_task.name,
-            task_id=u'will_succeed',
+            task_id='will_succeed',
             args=[],
             kwargs={},
-            exc=u'NetworkErrorMaybe?()',
+            exc='NetworkErrorMaybe?()',
         ),
         models.FailedTask.objects.create(
             task_name=tasks.passing_task.name,
-            task_id=u'other_task',
+            task_id='other_task',
             args=[],
             kwargs={},
-            exc=u'RaceCondition()',
+            exc='RaceCondition()',
         ),
     ]
 
@@ -53,19 +53,19 @@ def failed_tasks():
 @pytest.mark.django_db
 @pytest.mark.usefixtures('failed_tasks')
 def test_call_command():
-    call_command(u'reapply_tasks')
-    assert_unresolved(models.FailedTask.objects.get(task_id=u'fail_again'))
-    assert_resolved(models.FailedTask.objects.get(task_id=u'will_succeed'))
-    assert_resolved(models.FailedTask.objects.get(task_id=u'other_task'))
+    call_command('reapply_tasks')
+    assert_unresolved(models.FailedTask.objects.get(task_id='fail_again'))
+    assert_resolved(models.FailedTask.objects.get(task_id='will_succeed'))
+    assert_resolved(models.FailedTask.objects.get(task_id='other_task'))
 
 
 @pytest.mark.django_db
 @pytest.mark.usefixtures('failed_tasks')
 def test_call_command_with_specified_task():
-    call_command(u'reapply_tasks', u'--task-name={}'.format(tasks.fallible_task.name))
-    assert_unresolved(models.FailedTask.objects.get(task_id=u'fail_again'))
-    assert_resolved(models.FailedTask.objects.get(task_id=u'will_succeed'))
-    assert_unresolved(models.FailedTask.objects.get(task_id=u'other_task'))
+    call_command('reapply_tasks', f'--task-name={tasks.fallible_task.name}')
+    assert_unresolved(models.FailedTask.objects.get(task_id='fail_again'))
+    assert_resolved(models.FailedTask.objects.get(task_id='will_succeed'))
+    assert_unresolved(models.FailedTask.objects.get(task_id='other_task'))
 
 
 @pytest.mark.django_db
@@ -73,19 +73,19 @@ def test_call_command_with_specified_task():
 def test_duplicate_tasks():
     models.FailedTask.objects.create(
         task_name=tasks.fallible_task.name,
-        task_id=u'will_succeed',
+        task_id='will_succeed',
         args=[],
         kwargs={},
-        exc=u'AlsoThisOtherError()',
+        exc='AlsoThisOtherError()',
     )
     # Verify that only one task got run for this task_id.
     # pylint: disable=no-member
-    with mock.patch.object(tasks.fallible_task, u'apply_async', wraps=tasks.fallible_task.apply_async) as mock_apply:
-        call_command(u'reapply_tasks')
-        task_id_counts = Counter(call[2][u'task_id'] for call in mock_apply.mock_calls)
-        assert task_id_counts[u'will_succeed'] == 1
+    with mock.patch.object(tasks.fallible_task, 'apply_async', wraps=tasks.fallible_task.apply_async) as mock_apply:
+        call_command('reapply_tasks')
+        task_id_counts = Counter(call[2]['task_id'] for call in mock_apply.mock_calls)
+        assert task_id_counts['will_succeed'] == 1
     # Verify that both tasks matching that task_id are resolved.
-    will_succeed_tasks = models.FailedTask.objects.filter(task_id=u'will_succeed').all()
+    will_succeed_tasks = models.FailedTask.objects.filter(task_id='will_succeed').all()
     assert len(will_succeed_tasks) == 2
     for task_object in will_succeed_tasks:
         assert_resolved(task_object)
diff --git a/celery_utils/migrations/0001_initial.py b/celery_utils/migrations/0001_initial.py
index 74bf2c4..5995c97 100644
--- a/celery_utils/migrations/0001_initial.py
+++ b/celery_utils/migrations/0001_initial.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Generated by Django 1.10.5 on 2017-01-31 13:50
 
 
@@ -33,6 +32,6 @@ class Migration(migrations.Migration):
         ),
         migrations.AlterIndexTogether(
             name='failedtask',
-            index_together=set([('task_name', 'exc')]),
+            index_together={('task_name', 'exc')},
         ),
     ]
diff --git a/celery_utils/migrations/0002_chordable_django_backend.py b/celery_utils/migrations/0002_chordable_django_backend.py
index 3384a97..e3fc27c 100644
--- a/celery_utils/migrations/0002_chordable_django_backend.py
+++ b/celery_utils/migrations/0002_chordable_django_backend.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-
-
 from django.db import migrations
 
 
diff --git a/celery_utils/models.py b/celery_utils/models.py
index 5055d7d..e34ca60 100644
--- a/celery_utils/models.py
+++ b/celery_utils/models.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 Database models for celery_utils.
 """
diff --git a/docs/conf.py b/docs/conf.py
index 8d4bab1..a1d266b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # pylint: disable=invalid-name
 """
 edx-celeryutils documentation build configuration file.
diff --git a/requirements/base.txt b/requirements/base.txt
index 9b037d1..6172942 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -4,7 +4,7 @@
 #
 #    make upgrade
 #
-amqp==5.0.2
+amqp==5.0.3
     # via kombu
 billiard==3.6.3.0
     # via celery
@@ -28,7 +28,7 @@ django-model-utils==4.1.1
     # via -r requirements/base.in
 django==2.2.17
     # via
-    #   -c requirements/constraints.txt
+    #   -c https://raw.githubusercontent.com/edx/edx-lint/master/edx_lint/files/common_constraints.txt
     #   -r requirements/base.in
     #   django-model-utils
     #   jsonfield2
@@ -38,7 +38,7 @@ jsonfield2==4.0.0.post0
     # via -r requirements/base.in
 kombu==5.0.2
     # via celery
-prompt-toolkit==3.0.9
+prompt-toolkit==3.0.11
     # via click-repl
 pytz==2020.5
     # via
diff --git a/requirements/celery50.txt b/requirements/celery50.txt
index 8a6fbd8..9e9c21d 100644
--- a/requirements/celery50.txt
+++ b/requirements/celery50.txt
@@ -1,9 +1,9 @@
-amqp==5.0.2
+amqp==5.0.3
 billiard==3.6.3.0
 celery==5.0.4
 click-didyoumean==0.0.3
 click-repl==0.1.6
 click==7.1.2
 kombu==5.0.2
-prompt-toolkit==3.0.9
+prompt-toolkit==3.0.11
 vine==5.0.0
diff --git a/requirements/ci.txt b/requirements/ci.txt
index 8c29a89..4c5ce8a 100644
--- a/requirements/ci.txt
+++ b/requirements/ci.txt
@@ -40,11 +40,11 @@ toml==0.10.2
     # via tox
 tox-battery==0.6.1
     # via -r requirements/ci.in
-tox==3.20.1
+tox==3.21.2
     # via
     #   -r requirements/ci.in
     #   tox-battery
 urllib3==1.26.2
     # via requests
-virtualenv==20.2.2
+virtualenv==20.4.0
     # via tox
diff --git a/requirements/constraints.txt b/requirements/constraints.txt
index bf04409..f0051a5 100644
--- a/requirements/constraints.txt
+++ b/requirements/constraints.txt
@@ -8,8 +8,8 @@
 # pin when possible.  Writing an issue against the offending project and
 # linking to it here is good.
 
-# Stay on an LTS release
-django<2.3
+# This file contains all common constraints for edx-repos
+-c https://raw.githubusercontent.com/edx/edx-lint/master/edx_lint/files/common_constraints.txt
 
 # pinning it to latest release.
 celery==5.0.4
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 3a06d36..30c3223 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -10,14 +10,14 @@ astroid==2.4.2
     # via
     #   pylint
     #   pylint-celery
-bleach==3.2.1
+bleach==3.2.2
     # via readme-renderer
 certifi==2020.12.5
     # via requests
-cffi==1.14.4
-    # via cryptography
 chardet==4.0.0
-    # via requests
+    # via
+    #   diff-cover
+    #   requests
 click-log==0.3.2
     # via edx-lint
 click==7.1.2
@@ -27,15 +27,13 @@ click==7.1.2
     #   pip-tools
 colorama==0.4.4
     # via twine
-cryptography==3.3.1
-    # via secretstorage
-diff-cover==4.0.1
+diff-cover==4.2.0
     # via -r requirements/dev.in
 distlib==0.3.1
     # via virtualenv
 django==2.2.17
     # via
-    #   -c requirements/constraints.txt
+    #   -c https://raw.githubusercontent.com/edx/edx-lint/master/edx_lint/files/common_constraints.txt
     #   edx-i18n-tools
 docutils==0.16
     # via readme-renderer
@@ -57,10 +55,6 @@ isort==5.7.0
     # via
     #   -r requirements/quality.in
     #   pylint
-jeepney==0.6.0
-    # via
-    #   keyring
-    #   secretstorage
 jinja2-pluralize==0.3.0
     # via diff-cover
 jinja2==2.11.2
@@ -85,7 +79,7 @@ path==15.0.1
     # via path.py
 pip-tools==5.5.0
     # via -r requirements/dev.in
-pkginfo==1.6.1
+pkginfo==1.7.0
     # via twine
 pluggy==0.13.1
     # via
@@ -97,11 +91,9 @@ py==1.10.0
     # via tox
 pycodestyle==2.6.0
     # via -r requirements/quality.in
-pycparser==2.20
-    # via cffi
 pydocstyle==3.0.0
     # via -r requirements/quality.in
-pygments==2.7.3
+pygments==2.7.4
     # via
     #   diff-cover
     #   readme-renderer
@@ -123,7 +115,7 @@ pyparsing==2.4.7
     # via packaging
 pytz==2020.5
     # via django
-pyyaml==5.3.1
+pyyaml==5.4.1
     # via edx-i18n-tools
 readme-renderer==28.0
     # via twine
@@ -135,13 +127,10 @@ requests==2.25.1
     #   twine
 rfc3986==1.4.0
     # via twine
-secretstorage==3.3.0
-    # via keyring
 six==1.15.0
     # via
     #   astroid
     #   bleach
-    #   cryptography
     #   edx-i18n-tools
     #   edx-lint
     #   pydocstyle
@@ -158,17 +147,17 @@ toml==0.10.2
     #   tox
 tox-battery==0.6.1
     # via -r requirements/dev.in
-tox==3.20.1
+tox==3.21.2
     # via
     #   -r requirements/dev.in
     #   tox-battery
-tqdm==4.55.1
+tqdm==4.56.0
     # via twine
 twine==3.3.0
     # via -r requirements/dev.in
 urllib3==1.26.2
     # via requests
-virtualenv==20.2.2
+virtualenv==20.4.0
     # via tox
 webencodings==0.5.1
     # via bleach
diff --git a/requirements/doc.txt b/requirements/doc.txt
index 203b085..30102ed 100644
--- a/requirements/doc.txt
+++ b/requirements/doc.txt
@@ -6,13 +6,13 @@
 #
 alabaster==0.7.12
     # via sphinx
-amqp==5.0.2
+amqp==5.0.3
     # via kombu
 babel==2.9.0
     # via sphinx
 billiard==3.6.3.0
     # via celery
-bleach==3.2.1
+bleach==3.2.2
     # via readme-renderer
 celery==5.0.4
     # via
@@ -40,7 +40,7 @@ django-model-utils==4.1.1
     # via -r requirements/base.in
 django==2.2.17
     # via
-    #   -c requirements/constraints.txt
+    #   -c https://raw.githubusercontent.com/edx/edx-lint/master/edx_lint/files/common_constraints.txt
     #   -r requirements/base.in
     #   django-model-utils
     #   jsonfield2
@@ -52,7 +52,7 @@ docutils==0.16
     #   readme-renderer
     #   restructuredtext-lint
     #   sphinx
-edx-sphinx-theme==1.6.0
+edx-sphinx-theme==1.6.1
     # via -r requirements/doc.in
 future==0.18.2
     # via -r requirements/base.in
@@ -76,9 +76,9 @@ pbr==5.5.1
     # via stevedore
 pockets==0.9.1
     # via sphinxcontrib-napoleon
-prompt-toolkit==3.0.9
+prompt-toolkit==3.0.11
     # via click-repl
-pygments==2.7.3
+pygments==2.7.4
     # via
     #   doc8
     #   readme-renderer
@@ -107,7 +107,7 @@ six==1.15.0
     #   sphinxcontrib-napoleon
 snowballstemmer==2.0.0
     # via sphinx
-sphinx==3.4.2
+sphinx==3.4.3
     # via
     #   -r requirements/doc.in
     #   edx-sphinx-theme
diff --git a/requirements/pip.txt b/requirements/pip.txt
index af8270c..884d847 100644
--- a/requirements/pip.txt
+++ b/requirements/pip.txt
@@ -10,5 +10,5 @@ wheel==0.36.2
 # The following packages are considered to be unsafe in a requirements file:
 pip==20.3.3
     # via -r requirements/pip.in
-setuptools==51.1.1
+setuptools==51.3.3
     # via -r requirements/pip.in
diff --git a/requirements/test.txt b/requirements/test.txt
index 071b811..5fbf38f 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -30,11 +30,11 @@ ddt==1.4.1
 django-model-utils==4.1.1
     # via -r requirements/base.in
     # via
-    #   -c requirements/constraints.txt
+    #   -c https://raw.githubusercontent.com/edx/edx-lint/master/edx_lint/files/common_constraints.txt
     #   -r requirements/base.in
     #   django-model-utils
     #   jsonfield2
-freezegun==1.0.0
+freezegun==1.1.0
     # via -r requirements/test.in
 future==0.18.2
     # via -r requirements/base.in
@@ -49,13 +49,13 @@ packaging==20.8
     # via pytest
 pluggy==0.13.1
     # via pytest
-prompt-toolkit==3.0.9
+prompt-toolkit==3.0.11
     # via click-repl
 py==1.10.0
     # via pytest
 pyparsing==2.4.7
     # via packaging
-pytest-cov==2.10.1
+pytest-cov==2.11.1
     # via -r requirements/test.in
 pytest-django==4.1.0
     # via -r requirements/test.in
diff --git a/setup.py b/setup.py
old mode 100755
new mode 100644
index de1f7e4..f66ddc4
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 # pylint: disable=C0111,W6005,W6100
 
 
diff --git a/test_settings.py b/test_settings.py
index 91ce5c4..52aec82 100644
--- a/test_settings.py
+++ b/test_settings.py
@@ -76,4 +76,4 @@ def root(*args):
 CELERY_ALWAYS_EAGER = True
 
 results_dir = tempfile.TemporaryDirectory()
-CELERY_RESULT_BACKEND = 'file://{}'.format(results_dir.name)
+CELERY_RESULT_BACKEND = f'file://{results_dir.name}'
diff --git a/tests/test_logged_task.py b/tests/test_logged_task.py
index e1595ba..bdd3740 100644
--- a/tests/test_logged_task.py
+++ b/tests/test_logged_task.py
@@ -9,8 +9,9 @@
 
 """
 
+from unittest import mock
+
 from billiard.einfo import ExceptionInfo
-import mock
 import pytest
 
 from celery_utils.logged_task import LoggedTask
diff --git a/tox.ini b/tox.ini
index 1eba6da..568717f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,7 @@
 [tox]
-envlist = py38-celery{50}-django{22,30}
+envlist = py38-celery{50}-django{22,30,31}
 
 [doc8]
-; D001 = Line too long. Reason: No hard line-breaks in docs (see OEP-0019).
 ignore = D001
 
 [pycodestyle]
@@ -10,11 +9,6 @@ exclude = .git,.tox,migrations
 max-line-length = 120
 
 [pydocstyle]
-; D101 = Missing docstring in public class
-; D105 = Missing docstring in magic method
-; D200 = One-line docstring should fit on one line with quotes
-; D203 = 1 blank line required before class docstring
-; D212 = Multi-line docstring summary should start at the first line
 ignore = D101,D105,D200,D203,D212
 match-dir = (?!migrations)
 
@@ -24,47 +18,49 @@ addopts = --cov celery_utils --cov-report term-missing --cov-report xml
 norecursedirs = .* docs requirements
 
 [testenv]
-deps =
-    django22: Django>=2.2,<2.3
-    django30: Django>=3.0,<3.1
-    celery50: -r{toxinidir}/requirements/celery50.txt
-    -r{toxinidir}/requirements/test.txt
-commands =
-     py.test tests/ celery_utils/ {posargs}
+deps = 
+	django22: Django>=2.2,<2.3
+	django30: Django>=3.0,<3.1
+	django31: Django>=3.1,<3.2
+	celery50: -r{toxinidir}/requirements/celery50.txt
+	-r{toxinidir}/requirements/test.txt
+commands = 
+	py.test tests/ celery_utils/ {posargs}
 
 [testenv:docs]
-setenv =
-    DJANGO_SETTINGS_MODULE = test_settings
-    PYTHONPATH = {toxinidir}
-whitelist_externals =
-    make
-    rm
-deps =
-    -r{toxinidir}/requirements/doc.txt
-commands =
-    doc8 --ignore-path docs/_build README.rst docs
-    rm -f docs/celery_utils.rst
-    rm -f docs/modules.rst
-    make -C docs clean
-    make -C docs html
-    python setup.py check --restructuredtext --strict
+setenv = 
+	DJANGO_SETTINGS_MODULE = test_settings
+	PYTHONPATH = {toxinidir}
+whitelist_externals = 
+	make
+	rm
+deps = 
+	-r{toxinidir}/requirements/doc.txt
+commands = 
+	doc8 --ignore-path docs/_build README.rst docs
+	rm -f docs/celery_utils.rst
+	rm -f docs/modules.rst
+	make -C docs clean
+	make -C docs html
+	python setup.py check --restructuredtext --strict
 
 [testenv:quality]
-whitelist_externals =
-    make
-    rm
-    touch
-deps =
-    -r{toxinidir}/requirements/doc.txt
-    -r{toxinidir}/requirements/quality.txt
-    -r{toxinidir}/requirements/test.txt
-commands =
-    touch tests/__init__.py
-    pylint celery_utils
-    pylint tests
-    pylint test_utils
-    rm tests/__init__.py
-    pycodestyle celery_utils tests
-    pydocstyle celery_utils tests
-    isort --check-only tests test_utils celery_utils manage.py setup.py test_settings.py
-    make help
+whitelist_externals = 
+	make
+	rm
+	touch
+deps = 
+	-r{toxinidir}/requirements/doc.txt
+	-r{toxinidir}/requirements/quality.txt
+	-r{toxinidir}/requirements/test.txt
+commands = 
+	touch tests/__init__.py
+	pylint celery_utils
+	pylint tests
+	pylint test_utils
+	rm tests/__init__.py
+	pycodestyle celery_utils tests
+	pydocstyle celery_utils tests
+	isort --check-only tests test_utils celery_utils manage.py setup.py test_settings.py
+	make help
+