diff --git a/pyproject.toml b/pyproject.toml
index e39015f..be4350e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,7 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Topic :: Scientific/Engineering",
   "Operating System :: POSIX :: Linux",
   "Operating System :: MacOS :: MacOS X",
@@ -82,7 +83,13 @@ regex = '''ff_version\s*=\s*"v?(?P<value>\d+\.\d+\.\d+)"'''
 [tool.cibuildwheel]
 # 32-bit and musl targets have no usable NetCDF C++4 story, and PyPy cannot
 # load the pybind11 module built here.
-skip = ["pp*", "*-musllinux_*", "*_i686", "*-win32"]
+# cp314t is the free-threaded build. An extension that does not declare
+# `py::mod_gil_not_used()` makes the interpreter re-enable the GIL on import,
+# so such a wheel advertises free-threading while silently switching it off.
+# _pyforefire makes no such declaration, and the C++ core keeps mutable global
+# state (see FireDomain's model registries and SimulationParameters), so it is
+# not safe to run without the GIL. Revisit only once that is addressed.
+skip = ["pp*", "*-musllinux_*", "*_i686", "*-win32", "cp314t-*"]
 test-command = [
   "python {project}/tests/python/test_wheel.py",
   "forefire -v",