diff --git a/pkgs/development/python-modules/fypp/default.nix b/pkgs/by-name/fy/fypp/package.nix
similarity index 73%
rename from pkgs/development/python-modules/fypp/default.nix
rename to pkgs/by-name/fy/fypp/package.nix
index 0303f517cad5..7785b67eda26 100644
--- a/pkgs/development/python-modules/fypp/default.nix
+++ b/pkgs/by-name/fy/fypp/package.nix
@@ -1,9 +1,9 @@
-{ lib, stdenv, fetchFromGitHub, buildPythonApplication }:
+{ lib, fetchFromGitHub, python3 }:
 
-buildPythonApplication rec {
+python3.pkgs.buildPythonApplication rec {
   pname = "fypp";
   version = "3.2";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "aradi";
@@ -12,6 +12,8 @@ buildPythonApplication rec {
     hash = "sha256-MgGVlOqOIrIVoDfBMVpFLT26mhYndxans2hfo/+jdoA=";
   };
 
+  nativeBuildInputs = [ python3.pkgs.setuptools ];
+
   meta = with lib; {
     description = "Python powered Fortran preprocessor";
     homepage = "https://github.com/aradi/fypp";
diff --git a/pkgs/development/python-modules/yasi/default.nix b/pkgs/development/python-modules/yasi/default.nix
index 8759e499b639..08068ed6b6b4 100644
--- a/pkgs/development/python-modules/yasi/default.nix
+++ b/pkgs/development/python-modules/yasi/default.nix
@@ -1,14 +1,15 @@
 { lib
-, buildPythonApplication
+, buildPythonPackage
 , colorama
 , fetchFromGitHub
 , pytestCheckHook
+, setuptools
 }:
 
-buildPythonApplication rec {
+buildPythonPackage rec {
   pname = "yasi";
   version = "2.1.2";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "nkmathew";
@@ -17,11 +18,15 @@ buildPythonApplication rec {
     hash = "sha256-xKhVTmh/vrtBkatxtk8R4yqbGroH0I+xTKNYUpuikt4=";
   };
 
+  nativeBuildInputs = [
+    setuptools
+  ];
+
   propagatedBuildInputs = [
     colorama
   ];
 
-  nativeBuildInputs = [
+  nativeCheckInputs = [
     pytestCheckHook
   ];
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e9439ffe2464..b97b92a2b661 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -23832,8 +23832,6 @@ with pkgs;
 
   toml-f = callPackage ../development/libraries/toml-f { };
 
-  fypp = python3Packages.callPackage ../development/python-modules/fypp { };
-
   dbcsr = callPackage ../development/libraries/science/math/dbcsr { };
 
   taco = callPackage ../development/libraries/taco { };