diff --git a/pkgs/development/python-modules/aniso8601/default.nix b/pkgs/development/python-modules/aniso8601/default.nix
index 4f6602395300..76b5d97e2813 100644
--- a/pkgs/development/python-modules/aniso8601/default.nix
+++ b/pkgs/development/python-modules/aniso8601/default.nix
@@ -3,7 +3,7 @@
 
 buildPythonPackage rec {
   pname = "aniso8601";
-  version = "4.1.0";
+  version = "6.0.0";
 
   meta = with stdenv.lib; {
     description = "Parses ISO 8601 strings.";
@@ -17,6 +17,6 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1x49k287ky1spv3msc9fwmc7ydyw6rlcr14nslgcmpjfn3pgzh03";
+    sha256 = "1bylfskk08ahyma25i8w3mcd0kywpxqx6icv5p7m1z0i8srak9mq";
   };
 }