diff --git a/pkgs/development/python-modules/demetriek/default.nix b/pkgs/development/python-modules/demetriek/default.nix
new file mode 100644
index 000000000000..99b889eae274
--- /dev/null
+++ b/pkgs/development/python-modules/demetriek/default.nix
@@ -0,0 +1,65 @@
+{ lib
+, aiohttp
+, awesomeversion
+, backoff
+, buildPythonPackage
+, pydantic
+, fetchFromGitHub
+, poetry-core
+, yarl
+, aresponses
+, pytest-asyncio
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "demetriek";
+  version = "0.4.0";
+  format = "pyproject";
+
+  disabled = pythonOlder "3.9";
+
+  src = fetchFromGitHub {
+    owner = "frenck";
+    repo = "python-demetriek";
+    rev = "refs/tags/v${version}";
+    sha256 = "sha256-LCHHBcZgO9gw5jyaJiiS4lKyb0ut+PJvKTylIvIKHhc=";
+  };
+
+  postPatch = ''
+    # Upstream doesn't set a version for the pyproject.toml
+    substituteInPlace pyproject.toml \
+      --replace "0.0.0" "${version}" \
+      --replace "--cov" ""
+  '';
+
+  nativeBuildInputs = [
+    poetry-core
+  ];
+
+  propagatedBuildInputs = [
+    aiohttp
+    awesomeversion
+    backoff
+    pydantic
+    yarl
+  ];
+
+  checkInputs = [
+    aresponses
+    pytest-asyncio
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "demetriek"
+  ];
+
+  meta = with lib; {
+    description = "Python client for LaMetric TIME devices";
+    homepage = "https://github.com/frenck/python-demetriek";
+    license = licenses.mit;
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 58b814a21b59..7fad286901a1 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2404,6 +2404,8 @@ in {
 
   deluge-client = callPackage ../development/python-modules/deluge-client { };
 
+  demetriek = callPackage ../development/python-modules/demetriek { };
+
   demjson3 = callPackage ../development/python-modules/demjson3 { };
 
   dendropy = callPackage ../development/python-modules/dendropy { };