diff --git a/pkgs/development/python-modules/fipy/default.nix b/pkgs/development/python-modules/fipy/default.nix
index d54379d0683..ab670e557da 100644
--- a/pkgs/development/python-modules/fipy/default.nix
+++ b/pkgs/development/python-modules/fipy/default.nix
@@ -1,6 +1,5 @@
 { lib
 , buildPythonPackage
-, fetchPypi
 , numpy
 , scipy
 , pyamg
@@ -18,41 +17,37 @@
 , fetchurl
 }:
 
-let
-  not_darwin_inputs = lib.optionals (! stdenv.isDarwin) [ gmsh ];
-in
-  buildPythonPackage rec {
-    pname = "fipy";
-    version = "3.4.1";
+buildPythonPackage rec {
+  pname = "fipy";
+  version = "3.4.2.1";
 
-    src = fetchurl {
-      url = "https://github.com/usnistgov/fipy/releases/download/${version}/FiPy-${version}.tar.gz";
-      sha256 = "0078yg96fknqhywn1v26ryc5z47c0j0c1qwz6p8wsjn0wmzggaqk";
-    };
+  src = fetchurl {
+    url = "https://github.com/usnistgov/fipy/releases/download/${version}/FiPy-${version}.tar.gz";
+    sha256 = "0v5yk9b4hksy3176w4vm4gagb9kxqgv75zcyswlqvl371qwy1grk";
+  };
 
-    propagatedBuildInputs = [
-      numpy
-      scipy
-      pyamg
-      matplotlib
-      tkinter
-      mpi4py
-      future
-      scikit-fmm
-      openssh
-    ] ++ lib.optionals isPy27 [ pysparse ] ++ not_darwin_inputs;
+  propagatedBuildInputs = [
+    numpy
+    scipy
+    pyamg
+    matplotlib
+    tkinter
+    mpi4py
+    future
+    scikit-fmm
+    openssh
+  ] ++ lib.optionals isPy27 [ pysparse ]
+  ++ lib.optionals (!stdenv.isDarwin) [ gmsh ];
 
-    checkInputs = not_darwin_inputs;
+  checkPhase = ''
+    export OMPI_MCA_plm_rsh_agent=${openssh}/bin/ssh
+    ${python.interpreter} setup.py test --modules
+  '';
 
-    checkPhase = ''
-      export OMPI_MCA_plm_rsh_agent=${openssh}/bin/ssh
-      ${python.interpreter} setup.py test --modules
-    '';
-
-    meta = with lib; {
-      homepage = "https://www.ctcms.nist.gov/fipy/";
-      description = "A Finite Volume PDE Solver Using Python";
-      license = licenses.free;
-      maintainers = with maintainers; [ costrouc wd15 ];
-    };
-  }
+  meta = with lib; {
+    homepage = "https://www.ctcms.nist.gov/fipy/";
+    description = "A Finite Volume PDE Solver Using Python";
+    license = licenses.free;
+    maintainers = with maintainers; [ costrouc wd15 ];
+  };
+}