diff --git a/pkgs/development/python-modules/keras/default.nix b/pkgs/development/python-modules/keras/default.nix
index 55deee586c8d..156f8f5c2cd5 100644
--- a/pkgs/development/python-modules/keras/default.nix
+++ b/pkgs/development/python-modules/keras/default.nix
@@ -1,6 +1,6 @@
 { lib, buildPythonPackage, fetchPypi
 , pytest, pytest-cov, pytest-xdist
-, six, numpy, scipy, pyyaml, h5py
+, six, numpy, scipy, pyyaml, h5py, optree
 , keras-applications, keras-preprocessing
 }:
 
diff --git a/pkgs/development/python-modules/optree/default.nix b/pkgs/development/python-modules/optree/default.nix
new file mode 100644
index 000000000000..d592c6d51f39
--- /dev/null
+++ b/pkgs/development/python-modules/optree/default.nix
@@ -0,0 +1,60 @@
+{ stdenv
+, buildPythonPackage
+, fetchFromGitHub
+, pythonOlder
+, lib
+, cmake
+, setuptools
+, typing-extensions
+, pybind11
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "optree";
+  version = "0.11.0";
+  pyproject = true;
+
+  disabled = pythonOlder "3.7";
+
+  src = fetchFromGitHub {
+    owner = "metaopt";
+    repo = pname;
+    rev = "v${version}";
+    hash = "sha256-VnnnEoXkYJO+S7baH+JZvsW18Tk3TiY9+Cd230OlZWo=";
+  };
+
+  dontUseCmakeConfigure = true;
+
+  propagatedBuildInputs = [
+    typing-extensions
+  ];
+  nativeBuildInputs = [
+    setuptools
+    pybind11
+    cmake
+  ];
+
+  nativeCheckInputs = [
+    pytestCheckHook
+  ];
+  # prevent import failures from pytest
+  preCheck = ''
+    rm -r optree
+  '';
+  disabledTests = [
+    # Fails because the 'test_treespec' module can't be found
+    "test_treespec_pickle_missing_registration"
+  ];
+  pythonImportsCheck = [
+    "optree"
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/metaopt/optree";
+    changelog = "https://github.com/metaopt/optree/releases/tag/v${version}";
+    description = "Optimized PyTree Utilities";
+    maintainers = with maintainers; [ pandapip1 ];
+    license = licenses.asl20;
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index c47843cad641..606734fba3b2 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -9283,6 +9283,8 @@ self: super: with self; {
 
   optimum = callPackage ../development/python-modules/optimum { };
 
+  optree = callPackage ../development/python-modules/optree { };
+
   optuna = callPackage ../development/python-modules/optuna { };
 
   opuslib = callPackage ../development/python-modules/opuslib { };