diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 05840ac..0320cf5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,8 +3,7 @@ on:
     branches:
       - master
   pull_request:
-  schedule:
-    - cron: '30 3 * * 2'
+  workflow_dispatch:
 
 name: CI
 
@@ -15,19 +14,21 @@ jobs:
     strategy:
       matrix:
         python:
-          - '3.5'
-          - '3.6'
-          - '3.7'
-          - 'pypy3'
+          - '3.9'
+          - '3.10'
+          - '3.11'
+          - '3.12'
+          - '3.13'
+          - 'pypy3.10'
         django:
-          - '1.11'
-          - '2.2'
-          - '3.0'
+          - '4.2'
+          - '5.0'
+          - '5.1'
     name: Python ${{ matrix.python }} / Django ${{ matrix.django }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Setup python ${{ matrix.python }}
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
       - name: Setup django ${{ matrix.django }}
@@ -39,7 +40,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Check code formatting
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Black Code Formatter
         uses: lgeiger/black-action@master
         with:
diff --git a/.gitignore b/.gitignore
index 6d18ee4..df77a8a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@
 /*.egg-info/
 /.tox/
 /.coverage
+/.env/
\ No newline at end of file
diff --git a/README.rst b/README.rst
index a560a7a..b0ea986 100644
--- a/README.rst
+++ b/README.rst
@@ -2,13 +2,13 @@
 django-mathfilters
 ##################
 
-.. image:: https://github.com/dbrgn/django-mathfilters/workflows/CI/badge.svg
+.. image:: https://github.com/dbrgn/django-mathfilters/actions/workflows/ci.yml/badge.svg
     :alt: Build status
-    :target: https://github.com/dbrgn/django-mathfilters/actions?query=branch%3Amaster
+    :target: https://github.com/dbrgn/django-mathfilters/actions/workflows/ci.yml
 
-.. image:: https://pypip.in/d/django-mathfilters/badge.png
-    :alt: PyPI download stats
-    :target: https://crate.io/packages/django-mathfilters
+.. image:: https://badge.fury.io/py/django-mathfilters.svg
+    :alt: PyPI badge
+    :target: https://pypi.org/project/django-mathfilters/
 
 
 django-mathfilters is a Python 3 module that provides different simple math
@@ -80,10 +80,11 @@ provides the following filters:
 Version Support
 ===============
 
-This module officially supports Python 3.5+ as well as PyPy3. Support for Python
-3.3 and 3.4 is provided on best-effort basis, but there are no CI tests for it.
+This module officially supports Python 3.9+ as well as PyPy3.
 
-Supported Django versions are 1.11+, 2.x and 3.x.
+Supported Django versions are 4.2, 5.0 and 5.1.
+
+Support for older versions of both is possible however there are no CI tests for them.
 
 
 Development
@@ -96,4 +97,4 @@ auto-formatting. Adherence to the rules is enforced in CI.
 License
 =======
 
-`MIT License <http://www.tldrlegal.com/license/mit-license>`_, see LICENSE file.
+`MIT License <https://www.tldrlegal.com/license/mit-license>`_, see LICENSE file.
diff --git a/pyproject.toml b/pyproject.toml
index 929821d..06bdfa9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,3 @@
 [tool.black]
-target-version = ['py33']
+target-version = ['py39']
 skip-string-normalization = true
diff --git a/setup.py b/setup.py
index 7e7ed90..e3a6c40 100644
--- a/setup.py
+++ b/setup.py
@@ -21,11 +21,11 @@
           'License :: OSI Approved :: MIT License',
           'Operating System :: OS Independent',
           'Programming Language :: Python :: 3',
-          'Programming Language :: Python :: 3.3',
-          'Programming Language :: Python :: 3.4',
-          'Programming Language :: Python :: 3.5',
-          'Programming Language :: Python :: 3.6',
-          'Programming Language :: Python :: 3.7',
+          'Programming Language :: Python :: 3.9',
+          'Programming Language :: Python :: 3.10',
+          'Programming Language :: Python :: 3.11',
+          'Programming Language :: Python :: 3.12',
+          'Programming Language :: Python :: 3.13',
           'Programming Language :: Python :: Implementation :: CPython',
           'Programming Language :: Python :: Implementation :: PyPy',
           'Topic :: Internet :: WWW/HTTP',