diff --git a/pkgs/development/python-modules/fn/default.nix b/pkgs/development/python-modules/fn/default.nix
index 0acdf24d954..e7a0d4c0416 100644
--- a/pkgs/development/python-modules/fn/default.nix
+++ b/pkgs/development/python-modules/fn/default.nix
@@ -2,12 +2,17 @@
 , buildPythonPackage
 , fetchpatch
 , fetchPypi
+, pythonAtLeast
 }:
 
 buildPythonPackage rec {
   pname = "fn";
   version = "0.4.3";
 
+  # Python 3.11 changed the API of the `inspect` module and fn was never
+  # updated to adapt; last commit was in 2014.
+  disabled = pythonAtLeast "3.11";
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "1nmsjmn8jb4gp22ksx0j0hhdf4y0zm8rjykyy2i6flzimg6q1kgq";