diff --git a/pkgs/development/python-modules/pymodbus/default.nix b/pkgs/development/python-modules/pymodbus/default.nix
index 9837885ecb5f..148015d169bb 100644
--- a/pkgs/development/python-modules/pymodbus/default.nix
+++ b/pkgs/development/python-modules/pymodbus/default.nix
@@ -21,14 +21,14 @@
 
 buildPythonPackage (finalAttrs: {
   pname = "pymodbus";
-  version = "3.12.1";
+  version = "3.13.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "pymodbus-dev";
     repo = "pymodbus";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-ISfAqZu6BSuXoISo8me7Z7BjvoEj6c2KgvuScjEiqd4=";
+    hash = "sha256-gaCD3bhwBXF08vn3v9OU2mT1WJycrqgtxUC8sRLmZ8Y=";
   };
 
   __darwinAllowLocalNetworking = true;