diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e29d32c..3db08ec 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -69,7 +69,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        version: ["3.9.x", "3.10.x", "3.11.x", "3.12.x"]
+        version: ["3.10.x", "3.11.x", "3.12.x", "3.13.x", "3.14.x"]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/pyproject.toml b/pyproject.toml
index 27a9ab0..2de8ce5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,8 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Programming Language :: Python :: 3",
 ]
 
diff --git a/tests/test_util.py b/tests/test_util.py
index 2c93d2c..7d49da8 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -1,3 +1,5 @@
+import sys
+
 import pytest
 
 from fastapi_problem import util
@@ -14,5 +16,22 @@
         (422, "Unprocessable Entity", "http-unprocessable-entity"),
     ],
 )
+@pytest.mark.skipif(sys.version_info >= (3, 13), reason="python version too new")
+def test_convert_status_code_legacy(status_code, title, code):
+    assert util.convert_status_code(status_code) == (title, code)
+
+
+@pytest.mark.parametrize(
+    ("status_code", "title", "code"),
+    [
+        (500, "Internal Server Error", "http-internal-server-error"),
+        (400, "Bad Request", "http-bad-request"),
+        (401, "Unauthorized", "http-unauthorized"),
+        (404, "Not Found", "http-not-found"),
+        (409, "Conflict", "http-conflict"),
+        (422, "Unprocessable Content", "http-unprocessable-content"),
+    ],
+)
+@pytest.mark.skipif(sys.version_info < (3, 13), reason="python version too old")
 def test_convert_status_code(status_code, title, code):
     assert util.convert_status_code(status_code) == (title, code)