diff --git a/pkgs/development/python-modules/sphinx-reredirects/default.nix b/pkgs/development/python-modules/sphinx-reredirects/default.nix
index b250106a46c99..877676192611d 100644
--- a/pkgs/development/python-modules/sphinx-reredirects/default.nix
+++ b/pkgs/development/python-modules/sphinx-reredirects/default.nix
@@ -2,7 +2,7 @@
   lib,
   buildPythonPackage,
   fetchPypi,
-  setuptools,
+  flit-core,
   sphinx,
 }:
 
@@ -18,7 +18,7 @@ buildPythonPackage rec {
   };
 
   build-system = [
-    setuptools
+    flit-core
   ];
 
   dependencies = [
diff --git a/pkgs/development/python-modules/sphinxext-opengraph/default.nix b/pkgs/development/python-modules/sphinxext-opengraph/default.nix
index 70bd42464cae0..e62e96f242a4c 100644
--- a/pkgs/development/python-modules/sphinxext-opengraph/default.nix
+++ b/pkgs/development/python-modules/sphinxext-opengraph/default.nix
@@ -7,13 +7,13 @@
   pytestCheckHook,
   pythonOlder,
   beautifulsoup4,
-  setuptools-scm,
+  flit-core,
 }:
 
 buildPythonPackage rec {
   pname = "sphinxext-opengraph";
   version = "0.12.0";
-  format = "setuptools";
+  pyproject = true;
 
   disabled = pythonOlder "3.8";
 
@@ -24,7 +24,7 @@ buildPythonPackage rec {
     hash = "sha256-2ch9BxgrqbfIJ8fzFKYscha4+G7OAVz+OIOqYwX2gSA=";
   };
 
-  nativeBuildInputs = [ setuptools-scm ];
+  build-system = [ flit-core ];
 
   optional-dependencies = {
     social_cards_generation = [ matplotlib ];