diff --git a/pkgs/development/python-modules/bacpypes/default.nix b/pkgs/development/python-modules/bacpypes/default.nix
index f07c5e90d51..e07b02a08e7 100644
--- a/pkgs/development/python-modules/bacpypes/default.nix
+++ b/pkgs/development/python-modules/bacpypes/default.nix
@@ -1,15 +1,16 @@
 { lib, buildPythonPackage, fetchPypi, fetchFromGitHub
-, wheel, pytestCheckHook, pytestrunner }:
+, wheel, pytestCheckHook, pytestrunner, pythonAtLeast }:
 
 buildPythonPackage rec {
-  version = "0.18.1";
+  version = "0.18.4";
   pname = "bacpypes";
+  disabled = pythonAtLeast "3.9";
 
   src = fetchFromGitHub {
     owner = "JoelBender";
     repo = "bacpypes";
     rev = version;
-    sha256 = "1fxrh57z3fjl95db8jh71grkv5id8qk65g6k5jqcs9v3dgkg8jkl";
+    sha256 = "1z5v0i7ms8na062wxd5ki43yy5z2d9cns0p4vdmkx2drwsbzlav2";
   };
 
   propagatedBuildInputs = [ wheel ];