diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e53820c0..a7f6e732 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.10"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "pypy3.10"]
         os: [ubuntu-24.04, windows-latest]
         exclude:
           - os: windows-latest
@@ -22,6 +22,8 @@ jobs:
             python-version: "3.11"
           - os: windows-latest
             python-version: "3.12"
+          - os: windows-latest
+            python-version: "3.13"
           - os: windows-latest
             python-version: "pypy3.10"
 
diff --git a/docs/code_examples/fastapi_async.py b/docs/code_examples/fastapi_async.py
index 3bedd187..80920252 100644
--- a/docs/code_examples/fastapi_async.py
+++ b/docs/code_examples/fastapi_async.py
@@ -10,7 +10,6 @@
 
 from fastapi import FastAPI, HTTPException
 from fastapi.responses import HTMLResponse
-
 from gql import Client, gql
 from gql.transport.aiohttp import AIOHTTPTransport
 
diff --git a/docs/code_examples/httpx_async_trio.py b/docs/code_examples/httpx_async_trio.py
index 058b952b..b76dab42 100644
--- a/docs/code_examples/httpx_async_trio.py
+++ b/docs/code_examples/httpx_async_trio.py
@@ -1,5 +1,4 @@
 import trio
-
 from gql import Client, gql
 from gql.transport.httpx import HTTPXAsyncTransport
 
diff --git a/setup.py b/setup.py
index 1a9918c4..6c12c95c 100644
--- a/setup.py
+++ b/setup.py
@@ -91,6 +91,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],
     keywords="api graphql protocol rest relay gql client",
diff --git a/tox.ini b/tox.ini
index 308aba00..4d6d4d2f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 envlist =
     black,flake8,import-order,mypy,manifest,
-    py{38,39,310,311,312,py3}
+    py{38,39,310,311,312,313,py3}
 
 [gh-actions]
 python =
@@ -10,6 +10,7 @@ python =
     3.10: py310
     3.11: py311
     3.12: py312
+    3.13: py313
     pypy-3: pypy3
 
 [testenv]
@@ -28,7 +29,7 @@ deps = -e.[test]
 commands =
     pip install -U setuptools
     ; run "tox -- tests -s" to show output for debugging
-    py{39,310,311,312,py3}: pytest {posargs:tests}
+    py{39,310,311,312,313,py3}: pytest {posargs:tests}
     py{38}: pytest {posargs:tests --cov-report=term-missing --cov=gql}
 
 [testenv:black]