diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7c91b63..7d73efd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -53,8 +53,9 @@ jobs:
       - mypy
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        python: [ '3.9', '3.10', '3.11', '3.12', '3.13']
+        python: [ '3.9', '3.10', '3.11', '3.12', '3.13', '3.14', '3.15' ]
     steps:
       - uses: actions/checkout@v7.0.1
       - name: Setup Build Tools
@@ -64,6 +65,7 @@ jobs:
       - name: Set Up Python
         uses: actions/setup-python@v7.0.0
         with:
+          allow-prereleases: true
           python-version: ${{ matrix.python }}
       - name: Install dependencies
         run: |
diff --git a/tests/conftest.py b/tests/conftest.py
index 79fc925..945c43d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -109,7 +109,15 @@ def http_server_port() -> int:
 
 @pytest.fixture(scope='session')
 def http_server(request, krb_realm: k5test.K5Realm, http_server_port: int):
-    ps = mp.Process(
+    # Python 3.14 changed the default multiprocessing start method on POSIX
+    # from "fork" to "forkserver". "forkserver" (and "spawn") pickle the
+    # target's arguments to hand them to the worker process, but the
+    # ``k5test.K5Realm`` object holds an unpicklable ``threading.Lock``
+    # (``TypeError: cannot pickle '_thread.lock' object``). Force the classic
+    # "fork" method so the realm is inherited via memory instead of pickled.
+    # These tests are POSIX/Kerberos-only, so "fork" is always available here.
+    ctx = mp.get_context('fork')
+    ps = ctx.Process(
         target=start_http_server,
         args=(krb_realm,),
         kwargs={'port': http_server_port},