diff --git a/pkgs/development/python-modules/amazon-ion/default.nix b/pkgs/development/python-modules/amazon-ion/default.nix
index a7569cd5d06a..0d4a9bd1578b 100644
--- a/pkgs/development/python-modules/amazon-ion/default.nix
+++ b/pkgs/development/python-modules/amazon-ion/default.nix
@@ -6,7 +6,7 @@
   fetchFromGitHub,
   jsonconversion,
   pytestCheckHook,
-  pythonOlder,
+  pytest_7,
   setuptools,
   six,
   tabulate,
@@ -17,8 +17,6 @@ buildPythonPackage rec {
   version = "0.13.0";
   pyproject = true;
 
-  disabled = pythonOlder "3.7";
-
   src = fetchFromGitHub {
     owner = "amazon-ion";
     repo = "ion-python";
@@ -33,9 +31,9 @@ buildPythonPackage rec {
       --replace "'pytest-runner'," ""
   '';
 
-  nativeBuildInputs = [ setuptools ];
+  build-system = [ setuptools ];
 
-  propagatedBuildInputs = [
+  dependencies = [
     jsonconversion
     six
   ];
@@ -43,7 +41,7 @@ buildPythonPackage rec {
   nativeCheckInputs = [
     cbor2
     docopt
-    pytestCheckHook
+    (pytestCheckHook.override { pytest = pytest_7; })
     tabulate
   ];