diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 70f3fadfb..59cfb8c13 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -54,6 +54,10 @@ jobs:
           name: Packages
           path: dist
       - run: tar xf dist/*.tar.gz --strip-components=1
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
       - uses: hynek/setup-cached-uv@v2
 
       - name: Prepare tox
@@ -62,7 +66,7 @@ jobs:
         run: |
           DO_MYPY=1
 
-          if [[ "$V" == "3.8" || "$V" == "3.9" ]]; then
+          if [[ "$V" == "3.8" || "$V" == "3.9" || "$V" == "3.14" ]]; then
             DO_MYPY=0
           fi
 
diff --git a/pyproject.toml b/pyproject.toml
index 024a16023..5212fcc3c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,7 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
   "Typing :: Typed",
@@ -30,7 +31,8 @@ dynamic = ["version", "readme"]
 
 [project.optional-dependencies]
 tests-mypy = [
-  'pytest-mypy-plugins; platform_python_implementation == "CPython" and python_version >= "3.10"',
+  # A transitive dependency of pytest-mypy-plugins doesn't build on 3.14 yet.
+  'pytest-mypy-plugins; platform_python_implementation == "CPython" and python_version >= "3.10" and python_version < "3.14"',
   # Since the mypy error messages keep changing, we have to keep updating this
   # pin.
   'mypy>=1.11.1; platform_python_implementation == "CPython" and python_version >= "3.10"',
diff --git a/tests/test_annotations.py b/tests/test_annotations.py
index 5c6296634..e193d4ba1 100644
--- a/tests/test_annotations.py
+++ b/tests/test_annotations.py
@@ -13,7 +13,6 @@
 import attr
 import attrs
 
-from attr._compat import PY_3_14_PLUS
 from attr._make import _is_class_var
 from attr.exceptions import UnannotatedAttributeError
 
@@ -588,8 +587,6 @@ def test_self_reference(self, slots):
         """
         References to self class using quotes can be resolved.
         """
-        if PY_3_14_PLUS and not slots:
-            pytest.xfail("References are changing a lot in 3.14.")
 
         @attr.s(slots=slots, auto_attribs=True)
         class A:
@@ -605,8 +602,6 @@ def test_forward_reference(self, slots):
         """
         Forward references can be resolved.
         """
-        if PY_3_14_PLUS and not slots:
-            pytest.xfail("Forward references are changing a lot in 3.14.")
 
         @attr.s(slots=slots, auto_attribs=True)
         class A:
diff --git a/tox.ini b/tox.ini
index 585c3c7c9..1ca8e2f24 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,9 @@
 [tox]
 min_version = 4
+# Mypy doesn't run on 3.14 yet.
 env_list =
     pre-commit,
-    py3{8,9,10,11,12,13}-tests,
+    py3{8,9,10,11,12,13,14}-tests,
     py3{10,11,12,13}-mypy,
     pypy3-tests,
     pyright,