diff --git a/pkgs/development/python-modules/pycrdt/default.nix b/pkgs/development/python-modules/pycrdt/default.nix
index 34c0484ee440..da505140c3e4 100644
--- a/pkgs/development/python-modules/pycrdt/default.nix
+++ b/pkgs/development/python-modules/pycrdt/default.nix
@@ -12,7 +12,6 @@
   pydantic,
   pytestCheckHook,
   trio,
-  y-py,
 
   nix-update-script,
 }:
@@ -50,7 +49,6 @@ buildPythonPackage rec {
     pydantic
     pytestCheckHook
     trio
-    y-py
   ];
 
   pytestFlags = [
diff --git a/pkgs/development/python-modules/y-py/default.nix b/pkgs/development/python-modules/y-py/default.nix
deleted file mode 100644
index 872ec058b9cf..000000000000
--- a/pkgs/development/python-modules/y-py/default.nix
+++ /dev/null
@@ -1,48 +0,0 @@
-{
-  lib,
-  stdenv,
-  buildPythonPackage,
-  fetchPypi,
-  rustPlatform,
-  cargo,
-  rustc,
-  libiconv,
-  pytestCheckHook,
-}:
-
-buildPythonPackage rec {
-  pname = "y-py";
-  version = "0.6.2";
-  pyproject = true;
-
-  src = fetchPypi {
-    pname = "y_py";
-    inherit version;
-    hash = "sha256-R1eoKlBAags6MzqgEiAZozG9bxbkn+1n3KQj+Siz/U0=";
-  };
-
-  cargoDeps = rustPlatform.fetchCargoVendor {
-    inherit pname version src;
-    hash = "sha256-Wh25tLOVhAYFLqjOrKSu4klB1hGSOMconC1xZG31Dbw=";
-  };
-
-  nativeBuildInputs = [
-    rustPlatform.cargoSetupHook
-    rustPlatform.maturinBuildHook
-    cargo
-    rustc
-  ];
-
-  buildInputs = lib.optional stdenv.hostPlatform.isDarwin libiconv;
-
-  pythonImportsCheck = [ "y_py" ];
-
-  nativeCheckInputs = [ pytestCheckHook ];
-
-  meta = {
-    description = "Python bindings for Y-CRDT";
-    homepage = "https://github.com/y-crdt/ypy";
-    license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [ dotlambda ];
-  };
-}
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index f4b2d782230d..76cc374d42c7 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -537,6 +537,7 @@ mapAliases {
   xapp = throw "'xapp' has been renamed to/replaced by 'python-xapp'"; # Converted to throw 2025-10-29
   xbox-webapi = throw "xbox-webapi was removed because Home Assistant switched to python-xbox"; # added 2025-12-03
   XlsxWriter = throw "'XlsxWriter' has been renamed to/replaced by 'xlsxwriter'"; # Converted to throw 2025-10-29
+  y-py = throw "'y-py' has been removed as it was archived upstream; consider using 'pycrdt' instead"; # Added 2026-01-21
   Yapsy = throw "'Yapsy' has been renamed to/replaced by 'yapsy'"; # Converted to throw 2025-10-29
   ypy-websocket = throw "'ypy-websocket' has been removed as it was archived upstream; consider using 'pycrdt-websocket' instead"; # Added 2026-01-21
   z3 = throw "'z3' has been renamed to/replaced by 'z3-solver'"; # Converted to throw 2025-10-29
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f077210e4f44..9766076552d1 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -20952,8 +20952,6 @@ self: super: with self; {
 
   xyzservices = callPackage ../development/python-modules/xyzservices { };
 
-  y-py = callPackage ../development/python-modules/y-py { };
-
   yabadaba = callPackage ../development/python-modules/yabadaba { };
 
   yacs = callPackage ../development/python-modules/yacs { };