diff --git a/pkgs/by-name/po/posting/package.nix b/pkgs/by-name/po/posting/package.nix
index 4550df713fd3..a46a63d7044e 100644
--- a/pkgs/by-name/po/posting/package.nix
+++ b/pkgs/by-name/po/posting/package.nix
@@ -6,14 +6,14 @@
 }:
 python3Packages.buildPythonApplication rec {
   pname = "posting";
-  version = "2.3.0";
+  version = "2.5.4";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "darrenburns";
     repo = "posting";
     tag = version;
-    hash = "sha256-lL85gJxFw8/e8Js+UCE9VxBMcmWRUkHh8Cq5wTC93KA=";
+    hash = "sha256-6nFQSGCdmR4qZuleiY0xh76WgBIjs9OZtfpc16b4iws=";
   };
 
   pythonRelaxDeps = true;
@@ -40,6 +40,7 @@ python3Packages.buildPythonApplication rec {
       httpx
       textual-autocomplete
       textual
+      openapi-pydantic
     ]
     ++ httpx.optional-dependencies.brotli
     ++ textual.optional-dependencies.syntax;
diff --git a/pkgs/development/python-modules/openapi-pydantic/default.nix b/pkgs/development/python-modules/openapi-pydantic/default.nix
new file mode 100644
index 000000000000..da4053638982
--- /dev/null
+++ b/pkgs/development/python-modules/openapi-pydantic/default.nix
@@ -0,0 +1,39 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  poetry-core,
+  pydantic,
+}:
+
+buildPythonPackage rec {
+  pname = "openapi-pydantic";
+  version = "0.5.1";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "mike-oakley";
+    repo = "openapi-pydantic";
+    rev = "v${version}";
+    hash = "sha256-SMAjzHGuu+QVWe/y8jQ4UWJI9f+pLR2BxgjvE6vOT0Q=";
+  };
+
+  build-system = [
+    poetry-core
+  ];
+
+  dependencies = [
+    pydantic
+  ];
+
+  pythonImportsCheck = [
+    "openapi_pydantic"
+  ];
+
+  meta = {
+    description = "Pydantic OpenAPI schema implementation";
+    homepage = "https://github.com/mike-oakley/openapi-pydantic";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ taha-yassine ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index c6ad9a06e110..cd98026bcb73 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -10151,6 +10151,8 @@ self: super: with self; {
 
   openapi-core = callPackage ../development/python-modules/openapi-core { };
 
+  openapi-pydantic = callPackage ../development/python-modules/openapi-pydantic { };
+
   openapi-schema-validator = callPackage ../development/python-modules/openapi-schema-validator { };
 
   openapi-spec-validator = callPackage ../development/python-modules/openapi-spec-validator { };