diff --git a/pkgs/development/python-modules/hahomematic/default.nix b/pkgs/development/python-modules/hahomematic/default.nix
index 333bcd2fed2e..afcd8841d3bd 100644
--- a/pkgs/development/python-modules/hahomematic/default.nix
+++ b/pkgs/development/python-modules/hahomematic/default.nix
@@ -2,6 +2,7 @@
 , aiohttp
 , buildPythonPackage
 , fetchFromGitHub
+, orjson
 , pydevccu
 , pytest-aiohttp
 , pytestCheckHook
@@ -24,7 +25,7 @@ buildPythonPackage rec {
     owner = "danielperna84";
     repo = pname;
     rev = "refs/tags/${version}";
-    sha256 = "sha256-Nrq7Bc9Lzdle8/rINp/GPy+DWANgMe7WCLP48gHohIo=";
+    hash = "sha256-Nrq7Bc9Lzdle8/rINp/GPy+DWANgMe7WCLP48gHohIo=";
   };
 
   nativeBuildInputs = [
@@ -33,6 +34,7 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [
     aiohttp
+    orjson
     python-slugify
     voluptuous
   ];