diff --git a/pkgs/development/python-modules/omnikinverter/default.nix b/pkgs/development/python-modules/omnikinverter/default.nix
index 869c9988cb80..788c0480fa64 100644
--- a/pkgs/development/python-modules/omnikinverter/default.nix
+++ b/pkgs/development/python-modules/omnikinverter/default.nix
@@ -1,7 +1,6 @@
 { lib
 , aiohttp
 , aresponses
-, asynctest
 , buildPythonPackage
 , fetchFromGitHub
 , poetry-core
@@ -13,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "omnikinverter";
-  version = "0.9.0";
+  version = "0.9.1";
   format = "pyproject";
 
   disabled = pythonOlder "3.9";
@@ -22,7 +21,7 @@ buildPythonPackage rec {
     owner = "klaasnicolaas";
     repo = "python-omnikinverter";
     rev = "refs/tags/v${version}";
-    hash = "sha256-V7rppl1u5QTzxkeLYgCFwgU6XuVENtb7EW/n+glwtSk=";
+    hash = "sha256-Vjfnwk9iIe5j+s/zJHQ2X095Eexp/aKtIi/k0sK45q0=";
   };
 
   nativeBuildInputs = [
@@ -36,7 +35,6 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [
     aresponses
-    asynctest
     pytest-asyncio
     pytestCheckHook
   ];