diff --git a/nix/pkgs/django-tailwind.nix b/nix/pkgs/django-tailwind.nix
index b4472f2ace..c99d93547a 100644
--- a/nix/pkgs/django-tailwind.nix
+++ b/nix/pkgs/django-tailwind.nix
@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, fetchPypi, django, poetry, cookiecutter }:
+{ lib, buildPythonPackage, fetchPypi, django, poetry-core, cookiecutter }:
 
 buildPythonPackage rec {
   pname = "django-tailwind";
@@ -14,7 +14,7 @@ buildPythonPackage rec {
       --replace 'cookiecutter = "^1.7.2"' 'cookiecutter = ">=1.7.2"'
   '';
 
-  nativeBuildInputs = [ poetry ];
+  nativeBuildInputs = [ poetry-core ];
   propagatedBuildInputs = [ django cookiecutter ];
   format = "pyproject";
 
diff --git a/third_party/default.nix b/third_party/default.nix
index b672b8b3a8..2c1c71297d 100644
--- a/third_party/default.nix
+++ b/third_party/default.nix
@@ -36,21 +36,11 @@ let
     rev = "e0fe990b478a66178a58c69cf53daec0478ca6f9";
     sha256 = "sha256:0qjyfmw5v7s6ynjns4a61vlyj9cghj7vbpgrp9147ngb1f8krz2c";
   };
-  nixpkgsOldSrc = nixpkgs.fetchFromGitHub {
-    owner = "nixos";
-    repo = "nixpkgs";
-    rev = "ae1dc133ea5f1538d035af41e5ddbc2ebcb67b90";
-    sha256 = "0dq22dagzk76x2ws4dz88w018i6byamd6rnzqizx68bzimg6g7xn";
-  };
-  nixpkgsOld = import "${nixpkgsOldSrc}" {
-    inherit system;
-    config = nixpkgsConfig;
-  };
 
   tvlDepot = import ./tvl { nixpkgsBisectPath = ./nixpkgs; inherit nixpkgsConfig; };
 in
 rec {
-  inherit nixpkgsConfig nixpkgs nixpkgsOld;
+  inherit nixpkgsConfig nixpkgs;
   nixos = import ./nixpkgs/nixos;
   nixeval = import ./nixpkgs/nixos/lib/eval-config.nix;
   buildGo =