diff --git a/pkgs/development/python-modules/lmfit/default.nix b/pkgs/development/python-modules/lmfit/default.nix
index 7a2045a7cce3..4a8cabbaa2b7 100644
--- a/pkgs/development/python-modules/lmfit/default.nix
+++ b/pkgs/development/python-modules/lmfit/default.nix
@@ -1,7 +1,6 @@
 {
   lib,
   buildPythonPackage,
-  fetchpatch,
   asteval,
   dill,
   fetchPypi,
@@ -19,22 +18,15 @@
 
 buildPythonPackage rec {
   pname = "lmfit";
-  version = "1.3.3";
+  version = "1.3.4";
   pyproject = true;
 
   disabled = pythonOlder "3.8";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-czIea4gfL2hiNXIaffwCr2uw8DCiXv62Zjj2KxxgU6E=";
+    hash = "sha256-PCLCjEP3F/bFtKO9geiTohSXOcJqWSwEby4zwjz75Jc=";
   };
-  patches = [
-    # https://github.com/lmfit/lmfit-py/issues/999
-    (fetchpatch {
-      url = "https://github.com/lmfit/lmfit-py/commit/d4f4e3755d50cb9720c616fcff2cd7b58fbabba5.patch";
-      hash = "sha256-h1WK3ajnoX3pOZOduFBKpPz3exfoKzkbO/QNgROLT7c=";
-    })
-  ];
 
   build-system = [
     setuptools