diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 7df88a31b6b..d4e565ddfdf 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3968,11 +3968,11 @@ pythonPackages = modules // import ./python-packages-generated.nix {
 
 
   nwdiag = buildPythonPackage rec {
-    name = "nwdiag-0.9.4";
+    name = "nwdiag-1.0.0";
 
     src = fetchurl {
       url = "https://pypi.python.org/packages/source/n/nwdiag/${name}.tar.gz";
-      md5 = "199b22f66ec3012c3999177d376a3842";
+      md5 = "d81581a028840f8f7362ab21bf73e941";
     };
 
     buildInputs = [ pep8 nose unittest2 docutils ];