diff --git a/pkgs/development/python-modules/iso8601/default.nix b/pkgs/development/python-modules/iso8601/default.nix
index a5eb03dc8eb..14cef7c62a8 100644
--- a/pkgs/development/python-modules/iso8601/default.nix
+++ b/pkgs/development/python-modules/iso8601/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , fetchPypi
 , hypothesis
+, poetry-core
 , pytestCheckHook
 , pytz
 , pythonOlder
@@ -10,7 +11,7 @@
 buildPythonPackage rec {
   pname = "iso8601";
   version = "1.0.2";
-  format = "setuptools";
+  format = "pyproject";
 
   disabled = pythonOlder "3.6";
 
@@ -19,6 +20,10 @@ buildPythonPackage rec {
     sha256 = "sha256-J/UDIg5oRdnblU+yErlbA2LYt+bBsjJqhwYcPek1lLE=";
   };
 
+  nativeBuildInputs = [
+    poetry-core
+  ];
+
   checkInputs = [
     hypothesis
     pytestCheckHook