diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 65d2407..57891c1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        python-version: [ "3.10", "3.11", "3.12", "3.13", "3.14" ]
+        python-version: [ "3.10", "3.11", "3.12", "3.13", "3.14", "3.14t" ]
     steps:
       - name: Checkout code
         uses: actions/checkout@v5
diff --git a/noxfile.py b/noxfile.py
index 19e21a8..44e5a40 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -7,7 +7,7 @@
 
 
 @session(
-    python=["3.10", "3.11", "3.12", "3.13", "3.14"],
+    python=["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t"],
     uv_groups=["test"],
 )
 def test(s: Session) -> None:
diff --git a/pyproject.toml b/pyproject.toml
index a2430be..7051777 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: Free Threading :: 3 - Stable",
     "Typing :: Typed",
     # Include this classifier to prevent accidentally publishing private code to PyPI.
     #   https://pypi.org/classifiers/