From f65bc664637c672dcb3d131104cf5df73ddb87c9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Randy=20D=C3=B6ring?=
 <30527984+radoering@users.noreply.github.com>
Date: Mon, 25 Aug 2025 11:02:11 +0200
Subject: [PATCH] installer: improve support of Python pre-releases

---
 src/poetry/puzzle/provider.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/poetry/puzzle/provider.py b/src/poetry/puzzle/provider.py
index 155d1204d4a..d10b25bf18a 100644
--- a/src/poetry/puzzle/provider.py
+++ b/src/poetry/puzzle/provider.py
@@ -202,9 +202,12 @@ def use_environment(self, env: Env) -> Iterator[Provider]:
         original_python_constraint = self._package_python_constraint
 
         self._env = env
+        # We use the stable version here to improve support of environments of Python pre-release
+        # versions, e.g. Python 3.14rc2. Without using the stable version here, a dependency with
+        # a marker like `python_version >= "3.14"` would not be installed.
         self._package_python_constraint = Version.parse(
             env.marker_env["python_full_version"]
-        )
+        ).stable
 
         try:
             yield self