diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 860cede6..65fdf7c1 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -22,17 +22,21 @@ jobs:
     if: "! contains(toJSON(github.event.commits.*.message), '[skip ci]')"
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
         platform: [ubuntu-latest, macos-latest, windows-latest]
         exclude: # Only test on the oldest and latest supported stable Python on macOS and Windows.
-          - platform: macos-latest
-            python-version: 3.9
-          - platform: windows-latest
-            python-version: 3.9
           - platform: macos-latest
             python-version: 3.10
           - platform: windows-latest
             python-version: 3.10
+          - platform: macos-latest
+            python-version: 3.11
+          - platform: windows-latest
+            python-version: 3.11
+          - platform: macos-latest
+            python-version: 3.13
+          - platform: windows-latest
+            python-version: 3.13
     steps:
     - uses: actions/checkout@v3.5.3
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/README.rst b/README.rst
index 36bc18fd..9591760d 100644
--- a/README.rst
+++ b/README.rst
@@ -26,7 +26,7 @@ into something that you wish fontParts did/didn't do.
 Installation
 ~~~~~~~~~~~~
 
-FontParts requires `Python <http://www.python.org/download/>`__ 3.8 or later.
+FontParts requires `Python <http://www.python.org/download/>`__ 3.9 or later.
 
 The package is listed in the Python Package Index (PyPI), so you can
 install it with `pip <https://pip.pypa.io>`__:
@@ -123,7 +123,7 @@ or the ``TOXENV`` environment variable:
    :target: https://github.com/robotools/fontParts/actions?query=workflow%3ATests
 .. |PyPI| image:: https://img.shields.io/pypi/v/fontParts.svg
    :target: https://pypi.org/project/fontParts
-.. |Versions| image:: https://img.shields.io/badge/python-3.8%2C%203.9%2C%203.10%2C%203.11-blue.svg
+.. |Versions| image:: https://img.shields.io/badge/python-3.9%2C%203.10%2C%203.11%2C%203.12%2C%203.13-blue.svg
    :alt: Python Versions
 .. |Coverage| image:: https://codecov.io/gh/robotools/fontParts/branch/master/graph/badge.svg
    :target: https://codecov.io/gh/robotools/fontParts
diff --git a/pyproject.toml b/pyproject.toml
index abb4cb93..85c01fd3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ write_to = 'Lib/fontParts/_version.py'
 write_to_template = '__version__ = "{version}"'
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py39"
 
 [tool.ruff.format]
 # Enable reformatting of code snippets in docstrings.
diff --git a/setup.py b/setup.py
index e557733a..ce55b5bf 100755
--- a/setup.py
+++ b/setup.py
@@ -46,7 +46,7 @@
         "Topic :: Multimedia :: Graphics :: Graphics Conversion",
         "Topic :: Software Development :: Libraries",
     ],
-    python_requires=">=3.8",
+    python_requires=">=3.9",
     zip_safe=True,
 )