diff --git a/pkgs/development/python-modules/pymodbus/default.nix b/pkgs/development/python-modules/pymodbus/default.nix
index a6e3f5eb9a74..e9cf439d36c1 100644
--- a/pkgs/development/python-modules/pymodbus/default.nix
+++ b/pkgs/development/python-modules/pymodbus/default.nix
@@ -21,14 +21,14 @@
 
 buildPythonPackage rec {
   pname = "pymodbus";
-  version = "3.1.2";
+  version = "3.1.3";
   format = "setuptools";
 
   src = fetchFromGitHub {
     owner = "pymodbus-dev";
     repo = pname;
     rev = "refs/tags/v${version}";
-    hash = "sha256-kae/TADu23NnCrXkJ/dkDBNIgBm/+BxXf+lh8uMxz/s=";
+    hash = "sha256-GHyDlt046v4KP9KQRnXH6F+3ikoCjbhVHEQuSdm99a8=";
   };
 
   # Twisted asynchronous version is not supported due to a missing dependency