diff --git a/pkgs/development/python-modules/plum-py/default.nix b/pkgs/development/python-modules/plum-py/default.nix
new file mode 100644
index 00000000000..50a33266c8f
--- /dev/null
+++ b/pkgs/development/python-modules/plum-py/default.nix
@@ -0,0 +1,29 @@
+{ lib, buildPythonPackage, fetchFromGitLab, isPy3k, pytest, baseline }:
+
+buildPythonPackage rec {
+  pname = "plum-py";
+  version = "0.4.0";
+  disabled = !isPy3k;
+
+  src = fetchFromGitLab {
+    owner = "dangass";
+    repo = "plum";
+    rev = "6a9ff863c0e9fa21f7b2230d25402155a5522e4b";
+    sha256 = "1iv62yb704c61b0dvsmyp3j6xpbmay532g9ny4pw4zbg3l69vd5j";
+  };
+
+  postPatch = ''
+    substituteInPlace src/plum/int/flag/_flag.py \
+      --replace 'if sys.version_info < (3, 7):' 'if True:'
+  '';
+
+  checkInputs = [ pytest baseline ];
+  checkPhase = "pytest tests";
+
+  meta = with lib; {
+    description = "Classes and utilities for packing/unpacking bytes";
+    homepage = "https://plum-py.readthedocs.io/en/latest/index.html";
+    license = licenses.mit;
+    maintainers = with maintainers; [ dnr ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 6cc22e7aeca..077ff2ffbe2 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5152,6 +5152,8 @@ in {
 
   plugwise = callPackage ../development/python-modules/plugwise { };
 
+  plum-py = callPackage ../development/python-modules/plum-py { };
+
   plumbum = callPackage ../development/python-modules/plumbum { };
 
   ply = callPackage ../development/python-modules/ply { };