diff --git a/pkgs/development/python-modules/bsblan/default.nix b/pkgs/development/python-modules/bsblan/default.nix
index ed13a3a3a7ba..e371079b3605 100644
--- a/pkgs/development/python-modules/bsblan/default.nix
+++ b/pkgs/development/python-modules/bsblan/default.nix
@@ -1,19 +1,16 @@
 { lib
+, aiohttp
+, aresponses
 , buildPythonPackage
 , fetchFromGitHub
-, pytestCheckHook
-, aresponses
-, coverage
 , mypy
+, packaging
 , poetry-core
 , pydantic
 , pytest-asyncio
-, pytest-cov
 , pytest-mock
+, pytestCheckHook
 , pythonOlder
-, aiohttp
-, attrs
-, cattrs
 , yarl
 }:
 
@@ -22,13 +19,13 @@ buildPythonPackage rec {
   version = "0.5.5";
   format = "pyproject";
 
-  disabled = pythonOlder "3.8";
+  disabled = pythonOlder "3.9";
 
   src = fetchFromGitHub {
     owner = "liudger";
     repo = "python-bsblan";
     rev = "v${version}";
-    sha256 = "sha256-kq4cML7D9XC/QRPjGfaWcs0H78OOc2IXGua7qJpWYOQ=";
+    hash = "sha256-kq4cML7D9XC/QRPjGfaWcs0H78OOc2IXGua7qJpWYOQ=";
   };
 
   nativeBuildInputs = [
@@ -37,22 +34,26 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [
     aiohttp
-    attrs
-    cattrs
+    packaging
     pydantic
     yarl
   ];
 
   checkInputs = [
     aresponses
-    coverage
     mypy
     pytest-asyncio
-    pytest-cov
     pytest-mock
     pytestCheckHook
   ];
 
+  postPatch = ''
+    # Upstream doesn't set a version for the pyproject.toml
+    substituteInPlace pyproject.toml \
+      --replace 'version = "0.0.0"' 'version = "${version}"' \
+      --replace "--cov" ""
+  '';
+
   pythonImportsCheck = [
     "bsblan"
   ];