diff --git a/pkgs/development/python-modules/pymodbus/default.nix b/pkgs/development/python-modules/pymodbus/default.nix
index e7b61578331c..25c768fb9def 100644
--- a/pkgs/development/python-modules/pymodbus/default.nix
+++ b/pkgs/development/python-modules/pymodbus/default.nix
@@ -21,7 +21,7 @@
 
 buildPythonPackage rec {
   pname = "pymodbus";
-  version = "3.8.6";
+  version = "3.9.0";
   pyproject = true;
 
   disabled = pythonOlder "3.9";
@@ -30,7 +30,7 @@ buildPythonPackage rec {
     owner = "pymodbus-dev";
     repo = "pymodbus";
     tag = "v${version}";
-    hash = "sha256-AnFPrjY6ukONAeCyHIzhtULm0vNjJugIxtuwACClzOo=";
+    hash = "sha256-8v48+wnxVBIXJhCn7/oHyoxPN8smWWNY/i5LMHhKUVk=";
   };
 
   build-system = [ setuptools ];