diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e6a96095..48dc8e52 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "pypy3.10"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15", "pypy3.10"]
         os: [ubuntu-24.04, windows-latest]
         exclude:
           - os: windows-latest
@@ -22,6 +22,8 @@ jobs:
             python-version: "3.13"
           - os: windows-latest
             python-version: "3.14"
+          - os: windows-latest
+            python-version: "3.15"
           - os: windows-latest
             python-version: "pypy3.10"
 
@@ -31,6 +33,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: ${{ matrix.python-version == '3.15' }}
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip wheel
diff --git a/setup.py b/setup.py
index 46ce5c34..4a73742c 100644
--- a/setup.py
+++ b/setup.py
@@ -33,8 +33,7 @@
     "mypy==2.1.0",
     "sphinx>=8.1.0,<9",
     "sphinx_rtd_theme>=3.0.2,<4",
-    "sphinx-argparse==0.5.2; python_version>='3.10'",
-    "sphinx-argparse==0.4.0; python_version<'3.10'",
+    "sphinx-argparse==0.5.2",
     "types-aiofiles",
     "types-requests",
 ] + tests_requires
@@ -100,6 +99,7 @@
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
         "Programming Language :: Python :: 3.14",
+        "Programming Language :: Python :: 3.15",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],
     keywords="api graphql protocol rest relay gql client",
diff --git a/tox.ini b/tox.ini
index 4bff921d..cc930ec2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 envlist =
     black,flake8,import-order,mypy,manifest,
-    py{310,311,312,313,314,py3}
+    py{310,311,312,313,314,315,py3}
 
 [gh-actions]
 python =
@@ -10,6 +10,7 @@ python =
     3.12: py312
     3.13: py313
     3.14: py314
+    3.15: py315
     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{310,311,312,313,314,py3}: pytest {posargs:tests}
+    py{310,311,312,313,314,315,py3}: pytest {posargs:tests}
     py{312}: pytest {posargs:tests --cov-report=term-missing --cov=gql}
 
 [testenv:black]