diff --git a/pkgs/development/python-modules/dill/default.nix b/pkgs/development/python-modules/dill/default.nix
index 03fc031da56e..3f1886dc61f6 100644
--- a/pkgs/development/python-modules/dill/default.nix
+++ b/pkgs/development/python-modules/dill/default.nix
@@ -3,7 +3,6 @@
   buildPythonPackage,
   fetchFromGitHub,
   python,
-  pythonAtLeast,
   setuptools,
 
   # passthru tests
@@ -13,17 +12,14 @@
 
 buildPythonPackage rec {
   pname = "dill";
-  version = "0.4.0";
-  format = "pyproject";
-
-  # https://github.com/uqfoundation/dill/issues/586
-  disabled = pythonAtLeast "3.14";
+  version = "0.4.0-unstable-2025-11-09";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "uqfoundation";
     repo = "dill";
-    tag = version;
-    hash = "sha256-RIyWTeIkK5cS4Fh3TK48XLa/EU9Iwlvcml0CTs5+Uh8=";
+    rev = "d948ecd748772f2812361982ec1496da0cd47b53";
+    hash = "sha256-/A84BpZnwSwsEYqLL0Xdf8OjJtg1UMu6dig3QEN+n1A=";
   };
 
   nativeBuildInputs = [ setuptools ];