diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 6546eeee..f7fd9e2f 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -29,8 +29,8 @@ jobs:
 
           - name: oldest supported versions
             os: ubuntu-latest
-            python: '3.9'
-            toxenv: py39-test-oldest
+            python: '3.10'
+            toxenv: py310-test-oldest
 
           - name: macOS latest supported
             os: macos-latest
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index f0fa350f..54c508f7 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -168,7 +168,7 @@ Before your pull request can be merged into the codebase, it will be reviewed by
 General Guidelines
 ^^^^^^^^^^^^^^^^^^
 
-- SkyPy is compatible with Python>=3.9 (see `setup.cfg <https://github.com/skypyproject/skypy/blob/main/setup.cfg>`_). SkyPy *does not* support backwards compatibility with Python 2.x; `six`, `__future__` and `2to3` should not be used.
+- SkyPy is compatible with Python>=3.10 (see `setup.cfg <https://github.com/skypyproject/skypy/blob/main/setup.cfg>`_). SkyPy *does not* support backwards compatibility with Python 2.x; `six`, `__future__` and `2to3` should not be used.
 - All contributions should follow the `PEP8 Style Guide for Python Code <https://www.python.org/dev/peps/pep-0008/>`_. We recommend using `flake8 <https://flake8.pycqa.org/>`__ to check your code for PEP8 compliance.
 - Importing SkyPy should only depend on having `NumPy <https://www.numpy.org>`_, `SciPy <https://www.scipy.org/>`_ and `Astropy <https://www.astropy.org/>`__ installed.
 - Code is grouped into submodules based on broad science areas e.g. `galaxies <https://skypy.readthedocs.io/en/stable/galaxies.html>`_. There is also a `utils <https://skypy.readthedocs.io/en/stable/utils/index.html>`_ submodule for general utility functions.
diff --git a/docs/install.rst b/docs/install.rst
index 4d368c63..b2e44c03 100644
--- a/docs/install.rst
+++ b/docs/install.rst
@@ -40,7 +40,7 @@ can be installed directly from GitHub using a recent version of pip:
 Dependencies
 ------------
 
-SkyPy is compatble with Python versions 3.9 or later on Ubuntu, macOS and
+SkyPy is compatble with Python versions 3.10 or later on Ubuntu, macOS and
 Windows operating systems. It has the following core dependencies:
 
 - `astropy <https://www.astropy.org/>`__
diff --git a/setup.cfg b/setup.cfg
index f827e7ce..9a749e21 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -14,7 +14,7 @@ github_project = skypyproject/skypy
 [options]
 zip_safe = False
 packages = find:
-python_requires = >=3.9
+python_requires = >=3.10
 setup_requires = setuptools_scm
 install_requires =
     astropy>=4
diff --git a/tox.ini b/tox.ini
index 157bc00b..0fe894d4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,9 @@
 [tox]
 envlist =
-    py{39,310,311,312,313}-test{,-all}{,-dev,-latest,-oldest}{,-cov}
-    py{39,310,311,312,313}-test-numpy{121,122,123,124,125,126,20,21,22,23,24}
-    py{39,310,311,312,313}-test-scipy{18,19,110,111,112,113,114,115,116,117}
-    py{39,310,311,312,313}-test-astropy{50,51,52,53,60,61,70,71,72}
+    py{310,311,312,313}-test{,-all}{,-dev,-latest,-oldest}{,-cov}
+    py{310,311,312,313}-test-numpy{121,122,123,124,125,126,20,21,22,23,24}
+    py{310,311,312,313}-test-scipy{18,19,110,111,112,113,114,115,116,117}
+    py{310,311,312,313}-test-astropy{50,51,52,53,60,61,70,71,72}
     build_docs
     linkcheck
     codestyle