diff --git a/pkgs/development/python-modules/roombapy/default.nix b/pkgs/development/python-modules/roombapy/default.nix
index 9a7642318aa1..075bf6ba084c 100644
--- a/pkgs/development/python-modules/roombapy/default.nix
+++ b/pkgs/development/python-modules/roombapy/default.nix
@@ -2,6 +2,7 @@
 , amqtt
 , buildPythonPackage
 , fetchFromGitHub
+, orjson
 , paho-mqtt
 , poetry-core
 , pytest-asyncio
@@ -11,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "roombapy";
-  version = "1.6.7";
+  version = "1.6.8";
   format = "pyproject";
 
   disabled = pythonOlder "3.7";
@@ -20,14 +21,24 @@ buildPythonPackage rec {
     owner = "pschmitt";
     repo = "roombapy";
     rev = "refs/tags/${version}";
-    hash = "sha256-cZoHUup3Znna4Za5twYyua3r03InapzU4c1aRrG6rpo=";
+    hash = "sha256-z9D9FiE+14/x05AFu3EpBYlAqpDPc5y6S+pLTsSO0cU=";
   };
 
+  postPatch = ''
+    # hbmqtt was replaced by amqtt
+    substituteInPlace tests/test_roomba_integration.py \
+      --replace "from hbmqtt.broker import Broker" "from amqtt.broker import Broker"
+
+    substituteInPlace pyproject.toml \
+      --replace 'orjson = ">=3.8.7"' 'orjson = "*"'
+  '';
+
   nativeBuildInputs = [
     poetry-core
   ];
 
   propagatedBuildInputs = [
+    orjson
     paho-mqtt
   ];
 
@@ -37,12 +48,6 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
-  postPatch = ''
-    # hbmqtt was replaced by amqtt
-    substituteInPlace tests/test_roomba_integration.py \
-      --replace "from hbmqtt.broker import Broker" "from amqtt.broker import Broker"
-  '';
-
   disabledTestPaths = [
     # Requires network access
     "tests/test_discovery.py"