diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 5bbb2acaea..5d371a8b80 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.9", "pypy-3.10"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "pypy-3.9", "pypy-3.10"]
         os: [ubuntu-22.04, macOS-latest, windows-latest]
         # Python 3.8 and 3.9 do not run on macOS-latest which
         # is now using arm64 hardware.
@@ -31,6 +31,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
         cache: 'pip'
+        allow-prereleases: true
     - name: Install dependencies
       run: |
         make
diff --git a/requirements-dev.txt b/requirements-dev.txt
index e80b18581e..77fedb9716 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,7 +1,7 @@
 -e .[socks]
 pytest>=2.8.0,<9
 pytest-cov
-pytest-httpbin==2.0.0
+pytest-httpbin==2.1.0
 httpbin~=0.10.0
 trustme
 wheel
diff --git a/setup.py b/setup.py
index e18aa18bb6..7d9b52bc3b 100755
--- a/setup.py
+++ b/setup.py
@@ -40,7 +40,7 @@
     "certifi>=2017.4.17",
 ]
 test_requirements = [
-    "pytest-httpbin==2.0.0",
+    "pytest-httpbin==2.1.0",
     "pytest-cov",
     "pytest-mock",
     "pytest-xdist",
@@ -87,6 +87,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
diff --git a/tox.ini b/tox.ini
index c438ef316a..79f74b2567 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py{38,39,310,311,312}-{default, use_chardet_on_py3}
+envlist = py{38,39,310,311,312,313}-{default, use_chardet_on_py3}
 
 [testenv]
 deps = -rrequirements-dev.txt