diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 43d9800f..9926c42b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        mongodb-version: [3.6, 4.0, 4.2]
+        mongodb-version: [3.6, 4.0, 4.2, 4.4]
         include:
           - name: "ubuntu-py36"
             python: "3.6"
@@ -27,6 +27,9 @@ jobs:
           - name: "ubuntu-py38"
             python: "3.8"
             tox_env: "py38"
+          - name: "ubuntu-py39"
+            python: "3.9"
+            tox_env: "py39"
           - name: "ubuntu-pypy3"
             python: "pypy3"
             tox_env: "pypy3"
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 07dcbbf0..7d99af2b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,23 +1,19 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.4.0
+    rev: v3.3.0
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
       - id: check-yaml
       - id: check-added-large-files
-  - repo: https://github.com/jumanjihouse/pre-commit-hooks
-    rev: 1.11.2
-    hooks:
-      - id: markdownlint
   - repo: https://github.com/psf/black
-    rev: stable
+    rev: 20.8b1
     hooks:
       - id: black
         language_version: python3.6
         exclude: ^docs/
   - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.7.9
+    rev: 3.8.4
     hooks:
       - id: flake8
         exclude: ^docs/|^examples/
diff --git a/.travis.yml b/.travis.yml
index df92d5f2..4b52b033 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,6 +21,10 @@ jobs:
       python: 3.8
       name: "Test on python 3.8"
       env: TOXENV=py38
+    - language: python
+      python: 3.9
+      name: "Test on python 3.9"
+      env: TOXENV=py39
     - language: python
       python: pypy3
       name: "Test on python pypy3"
diff --git a/flask_mongoengine/operation_tracker.py b/flask_mongoengine/operation_tracker.py
index 2c317a00..f2dbb854 100644
--- a/flask_mongoengine/operation_tracker.py
+++ b/flask_mongoengine/operation_tracker.py
@@ -250,8 +250,7 @@ def reset():
 
 
 def _get_ordering(son):
-    """Helper function to extract formatted ordering from dict.
-    """
+    """Helper function to extract formatted ordering from dict."""
 
     def fmt(field, direction):
         return "{0}{1}".format({-1: "-", 1: "+"}[direction], field)
diff --git a/setup.py b/setup.py
index 097d8829..7fac47b9 100644
--- a/setup.py
+++ b/setup.py
@@ -66,6 +66,7 @@ def get_version(version_tuple):
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: Implementation :: PyPy"
         "Programming Language :: Python :: Implementation :: CPython",
         "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
diff --git a/tests/test_pagination.py b/tests/test_pagination.py
index 605f53a7..496dcf87 100644
--- a/tests/test_pagination.py
+++ b/tests/test_pagination.py
@@ -35,7 +35,9 @@ def test_list_field_pagination(app, todo):
 
     comments = ["comment: %s" % i for i in range(42)]
     todo = Todo(
-        title="todo has comments", comments=comments, comment_count=len(comments),
+        title="todo has comments",
+        comments=comments,
+        comment_count=len(comments),
     ).save()
 
     # Check without providing a total
diff --git a/tox.ini b/tox.ini
index 764c28c0..7216f154 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = {py36,py37,py38,pypy3},lint
+envlist = {py36,py37,py38,py39,pypy3},lint
 
 [testenv]
 commands =