diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e3608b8..730bdb7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
           python-version: '3.10'
       - name: Install dependencies
         run: |
-          python -m pip install -U pip
+          python -m pip install --upgrade pip
           python -m pip install flake8
       - name: Check
         run: python -m flake8
@@ -38,10 +38,10 @@ jobs:
       - name: Set Up Python
         uses: actions/setup-python@v7.0.0
         with:
-          python-version: '3.13'
+          python-version: '3.x'
       - name: Install dependencies
         run: |
-          python -m pip install -U pip
+          python -m pip install --upgrade pip
           python -m pip install mypy .[all]
       - name: Check
         run: python -m mypy --install-types --non-interactive
@@ -55,6 +55,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        httpx: [ 'httpx', 'httpx2' ]
         python:
           - '3.9'
           - '3.10'
@@ -76,10 +77,12 @@ jobs:
           python-version: ${{ matrix.python }}
       - name: Install dependencies
         run: |
-          python -m pip install -U pip
-          python -m pip install -U setuptools wheel
-          python -m pip install -U .[all] pytest-cov codecov
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade setuptools wheel
+          python -m pip install --upgrade .[all] pytest-cov codecov
       - name: Run Tests
+        env:
+          HTTPX: ${{ matrix.httpx }}
         run: python -m pytest --cov=httpx_gssapi --cov-report=xml
       - name: Upload Coverage
         run: python -m codecov --token=${{ secrets.CODECOV_TOKEN }}
@@ -97,11 +100,11 @@ jobs:
       - name: Set Up Python
         uses: actions/setup-python@v7.0.0
         with:
-          python-version: '3.10'
+          python-version: '3.x'
       - name: Install dependencies
         run: |
-          python -m pip install -U pip
-          python -m pip install -U setuptools wheel
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade setuptools wheel
       - name: Build
         run: python setup.py sdist bdist_wheel
       - name: Change Log
diff --git a/httpx_gssapi/__init__.py b/httpx_gssapi/__init__.py
index 3c53224..36a3da5 100644
--- a/httpx_gssapi/__init__.py
+++ b/httpx_gssapi/__init__.py
@@ -7,7 +7,7 @@
 of requests_gssapi to HTTPX and adds optional GSSAPI authentication support and
 supports mutual authentication. Basic GET usage:
 
-    >>> import httpx
+    >>> import httpx  # or `import httpx2`
     >>> from httpx_gssapi import HTTPSPNEGOAuth
     >>> r = httpx.get("http://example.org", auth=HTTPSPNEGOAuth())
 
diff --git a/httpx_gssapi/exceptions.py b/httpx_gssapi/exceptions.py
index 86a6868..daaf36d 100644
--- a/httpx_gssapi/exceptions.py
+++ b/httpx_gssapi/exceptions.py
@@ -6,9 +6,13 @@
 
 """
 
+from os import getenv
 from typing import Optional
 
-from httpx import RequestError, Request, Response
+if getenv("HTTPX") == "httpx2":
+    from httpx2 import RequestError, Request, Response
+else:
+    from httpx import RequestError, Request, Response  # type: ignore[assignment]
 
 
 class MutualAuthenticationError(RequestError):
diff --git a/httpx_gssapi/gssapi_.py b/httpx_gssapi/gssapi_.py
index 0f5a99b..a9e70a3 100644
--- a/httpx_gssapi/gssapi_.py
+++ b/httpx_gssapi/gssapi_.py
@@ -2,6 +2,7 @@
 import logging
 from itertools import chain
 from functools import wraps
+from os import getenv
 from typing import Generator, Optional, List, Any, Union
 
 from base64 import b64encode, b64decode
@@ -10,8 +11,12 @@
 from gssapi import SecurityContext
 from gssapi.exceptions import GSSError
 
-import httpx
-from httpx import Auth, Request, Response
+if getenv("HTTPX") == "httpx2":
+    import httpx2 as httpx
+    from httpx2 import Auth, Request, Response
+else:
+    import httpx  # type: ignore[no-redef]
+    from httpx import Auth, Request, Response  # type: ignore[assignment]
 
 from .exceptions import MutualAuthenticationError, SPNEGOExchangeError
 
diff --git a/setup.cfg b/setup.cfg
index fb45282..353f945 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,6 +28,7 @@ python_requires = >=3.9
 packages = httpx_gssapi
 install_requires =
     httpx>=0.16,<0.29
+    httpx2
     gssapi
 
 [options.extras_require]
@@ -83,7 +84,7 @@ packages =
     tests
 
 [tox:tox]
-envlist = py36, py37, py38, py39, py310
+envlist = py39, py310, py311, py312, py313, py314, py315
 
 [testenv]
 deps =
diff --git a/tests/test_end_to_end.py b/tests/test_end_to_end.py
index 4c1cc48..c70cd24 100644
--- a/tests/test_end_to_end.py
+++ b/tests/test_end_to_end.py
@@ -1,7 +1,13 @@
 #!/usr/bin/env python
 """Tests for httpx_gssapi."""
+
+from os import getenv
+
+if getenv("HTTPX") == "httpx2":
+    import httpx2 as httpx
+else:
+    import httpx  # type: ignore[no-redef]
 import gssapi
-import httpx
 import k5test  # type: ignore[import-untyped]
 import pytest
 
diff --git a/tests/test_mocked.py b/tests/test_mocked.py
index 770bfc3..7bc0508 100644
--- a/tests/test_mocked.py
+++ b/tests/test_mocked.py
@@ -3,11 +3,15 @@
 
 import logging
 from base64 import b64encode
+from os import getenv
 from unittest.mock import Mock, patch
 
 import pytest
 
-import httpx
+if getenv("HTTPX") == "httpx2":
+    import httpx2 as httpx
+else:
+    import httpx  # type: ignore[no-redef]
 
 import gssapi
 import gssapi.exceptions