Add support for Python 3.13

.github/workflows/tests.yml

@@ -18,11 +18,12 @@ jobs:
           - "pypy3.10"
           - "3.11"
           - "3.12"
+          - "3.13"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true

pyproject.toml

@@ -21,6 +21,7 @@ classifiers = [
   "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 :: Security :: Cryptography",

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 # Environment changes have to be manually synced with '.travis.yml'.
-envlist = py{38,39,310,311,312}
+envlist = py{38,39,310,311,312,313}
 isolated_build = True
 
 [pytest]