diff --git a/pkgs/development/python-modules/dataclass-factory/default.nix b/pkgs/development/python-modules/dataclass-factory/default.nix
index fd7f1e2a1184..2a8b542ca99f 100644
--- a/pkgs/development/python-modules/dataclass-factory/default.nix
+++ b/pkgs/development/python-modules/dataclass-factory/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  pythonAtLeast,
   nose2,
   typing-extensions,
 }:
@@ -11,6 +12,9 @@ buildPythonPackage rec {
   version = "2.16";
   format = "setuptools";
 
+  # upstream 2.x branch abandoned since 2022; v3 was renamed to adaptix
+  disabled = pythonAtLeast "3.14";
+
   src = fetchFromGitHub {
     owner = "reagento";
     repo = "dataclass-factory";