diff --git a/pkgs/development/python-modules/apipkg/default.nix b/pkgs/development/python-modules/apipkg/default.nix
index be010b2011cd..e00aa158a551 100644
--- a/pkgs/development/python-modules/apipkg/default.nix
+++ b/pkgs/development/python-modules/apipkg/default.nix
@@ -19,6 +19,12 @@ buildPythonPackage rec {
     hash = "sha256-ANLD7fUMKN3RmAVjVkcpwUH6U9ASalXdwKtPpoC8Urs=";
   };
 
+  # support pytest 9: https://github.com/pytest-dev/apipkg/pull/58
+  postPatch = ''
+    substituteInPlace conftest.py \
+      --replace-fail 'def pytest_report_header(startdir):' 'def pytest_report_header():'
+  '';
+
   build-system = [
     hatch-vcs
     hatchling