diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 850bc95..7567dd6 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -5,18 +5,20 @@ jobs:
   unittest:
     runs-on: blacksmith-4vcpu-ubuntu-2204
     strategy:
+      fail-fast: false
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
     steps:
       - name: Install system packages
         run: sudo apt update && sudo apt-get install libcurl4-openssl-dev libssl-dev
       - name: Check out code from GitHub
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Set up Python ${{ matrix.python-version }}
         id: python
         uses: actions/setup-python@main
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
       - name: Install dependencies
         run: pip install --upgrade pip setuptools wheel tox tox-gh-actions tox-docker
       - name: Run unittest
diff --git a/billiard/compat.py b/billiard/compat.py
index bea9746..b20677c 100644
--- a/billiard/compat.py
+++ b/billiard/compat.py
@@ -192,7 +192,7 @@ def spawnv_passfds(path, args, passfds):
             if sys.version_info >= (3, 9):
                 args.extend((None, None, None, -1))  # group, extra_groups, user, umask
             args.append(None)  # preexec_fn
-            if sys.version_info >= (3, 11):
+            if (3, 11) <= sys.version_info < (3, 14):
                 args.append(subprocess._USE_VFORK)
             return _posixsubprocess.fork_exec(*args)
         finally:
diff --git a/tox.ini b/tox.ini
index 3d1212c..5e37f7d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 requires =
     tox-gh-actions
-envlist = {3.8,3.9,3.10,3.11,3.12,3.13}-unit
+envlist = {3.8,3.9,3.10,3.11,3.12,3.13,3.14}-unit
 skip_missing_interpreters = True
 
 [gh-actions]
@@ -12,6 +12,7 @@ python =
     3.11: 3.11-unit
     3.12: 3.12-unit
     3.13: 3.13-unit
+    3.14: 3.14-unit
 
 [testenv]
 distribute = True