diff --git a/pkgs/development/python-modules/openapi3/default.nix b/pkgs/development/python-modules/openapi3/default.nix
index 1ddd3a9bbfb6..ee4a35dd011c 100644
--- a/pkgs/development/python-modules/openapi3/default.nix
+++ b/pkgs/development/python-modules/openapi3/default.nix
@@ -11,7 +11,7 @@
   uvloop,
   hypercorn,
   starlette,
-  pydantic_1,
+  pydantic,
 }:
 
 buildPythonPackage rec {
@@ -27,9 +27,12 @@ buildPythonPackage rec {
     hash = "sha256-Crn+nRbptRycnWJzH8Tm/BBLcBSRCcNtLX8NoKnSDdA=";
   };
 
-  nativeBuildInputs = [ setuptools ];
+  # pydantic==1.10.2 only affects checks
+  pythonRelaxDeps = [ "pydantic" ];
 
-  propagatedBuildInputs = [
+  build-system = [ setuptools ];
+
+  dependencies = [
     requests
     pyyaml
   ];
@@ -37,7 +40,7 @@ buildPythonPackage rec {
   nativeCheckInputs = [
     pytestCheckHook
     pytest-asyncio
-    pydantic_1
+    pydantic
     uvloop
     hypercorn
     starlette