diff --git a/pkgs/development/python-modules/propka/default.nix b/pkgs/development/python-modules/propka/default.nix
index 71c6c9db2fad..eb8d0bc0deae 100644
--- a/pkgs/development/python-modules/propka/default.nix
+++ b/pkgs/development/python-modules/propka/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  fetchpatch,
   setuptools,
   pytestCheckHook,
 }:
@@ -18,6 +19,15 @@ buildPythonPackage rec {
     hash = "sha256-EJQqCe4WPOpqsSxxfbTjF0qETpSPYqpixpylweTCjko=";
   };
 
+  patches = [
+    # Upstream PR: https://github.com/jensengroup/propka/pull/202
+    (fetchpatch {
+      name = "python-3.14.patch";
+      url = "https://github.com/jensengroup/propka/commit/5eb80b7836b2e71b37598d2c7fa06ed8141ff6fd.patch";
+      hash = "sha256-tuhUfc7SGjdGxAPcsbrwOyqgTesg7k+FruJjY05YOUs=";
+    })
+  ];
+
   nativeBuildInputs = [ setuptools ];
 
   nativeCheckInputs = [ pytestCheckHook ];