diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3eb26124..8575b7b4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,15 +14,16 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - {name: '3.13', python: '3.13', tox: py313}
           - {name: '3.12', python: '3.12', tox: py312}
           - {name: '3.11', python: '3.11', tox: py311}
           - {name: '3.10', python: '3.10', tox: py310}
           - {name: '3.9', python: '3.9', tox: py39}
           - {name: '3.8', python: '3.8', tox: py38}
-          - {name: 'format', python: '3.12', tox: format}
-          - {name: 'mypy', python: '3.12', tox: mypy}
-          - {name: 'pep8', python: '3.12', tox: pep8}
-          - {name: 'package', python: '3.12', tox: package}
+          - {name: 'format', python: '3.13', tox: format}
+          - {name: 'mypy', python: '3.13', tox: mypy}
+          - {name: 'pep8', python: '3.13', tox: pep8}
+          - {name: 'package', python: '3.13', tox: package}
 
     steps:
       - uses: actions/checkout@v4
@@ -56,7 +57,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.12"
+          python-version: "3.13"
 
       - name: update pip
         run: |
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 5e011a7c..0f4486df 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -11,7 +11,7 @@ jobs:
 
       - uses: actions/setup-python@v3
         with:
-          python-version: 3.12
+          python-version: 3.13
 
       - run: |
           pip install poetry
diff --git a/pyproject.toml b/pyproject.toml
index 7a6b6a84..beb6a860 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
diff --git a/tox.ini b/tox.ini
index d931bfab..52748df5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = docs,format,mypy,py38,py39,py310,py311,py312,package,pep8
+envlist = docs,format,mypy,py38,py39,py310,py311,py312,py313,package,pep8
 minversion = 3.3
 isolated_build = true
 
@@ -16,7 +16,7 @@ deps =
 commands = pytest --cov=hypercorn {posargs}
 
 [testenv:docs]
-basepython = python3.12
+basepython = python3.13
 deps =
     pydata-sphinx-theme
     sphinx
@@ -27,7 +27,7 @@ commands =
     sphinx-build -W --keep-going -b html -d {envtmpdir}/doctrees docs/ docs/_build/html/
 
 [testenv:format]
-basepython = python3.12
+basepython = python3.13
 deps =
     black
     isort
@@ -36,7 +36,7 @@ commands =
     isort --check --diff src/hypercorn tests
 
 [testenv:pep8]
-basepython = python3.12
+basepython = python3.13
 deps =
     flake8
     pep8-naming
@@ -45,7 +45,7 @@ deps =
 commands = flake8 src/hypercorn/ tests/
 
 [testenv:mypy]
-basepython = python3.12
+basepython = python3.13
 deps =
     mypy
     pytest
@@ -54,7 +54,7 @@ commands =
     mypy src/hypercorn/ tests/
 
 [testenv:package]
-basepython = python3.12
+basepython = python3.13
 deps =
     poetry
     twine