diff --git a/pkgs/development/python-modules/dlms-cosem/default.nix b/pkgs/development/python-modules/dlms-cosem/default.nix
new file mode 100644
index 000000000000..e6040fb7860a
--- /dev/null
+++ b/pkgs/development/python-modules/dlms-cosem/default.nix
@@ -0,0 +1,51 @@
+{ lib
+, asn1crypto
+, attrs
+, buildPythonPackage
+, cryptography
+, fetchFromGitHub
+, pyserial
+, pytestCheckHook
+, python-dateutil
+, pythonOlder
+, typing-extensions
+}:
+
+buildPythonPackage rec {
+  pname = "dlms-cosem";
+  version = "21.3.2";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
+
+  src = fetchFromGitHub {
+    owner = "pwitab";
+    repo = pname;
+    rev = "refs/tags/${version}";
+    sha256 = "sha256-BrLanP+SIRRof15yzqwcDOxw92phbW7m9CfORz0xo7I=";
+  };
+
+  propagatedBuildInputs = [
+    asn1crypto
+    attrs
+    cryptography
+    pyserial
+    python-dateutil
+    typing-extensions
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "dlms_cosem"
+  ];
+
+  meta = with lib; {
+    description = "Python module to parse DLMS/COSEM";
+    homepage = "https://github.com/pwitab/dlms-cosem";
+    license = with licenses; [ mit ];
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/development/python-modules/dsmr-parser/default.nix b/pkgs/development/python-modules/dsmr-parser/default.nix
index c91677710817..883ea432cd22 100644
--- a/pkgs/development/python-modules/dsmr-parser/default.nix
+++ b/pkgs/development/python-modules/dsmr-parser/default.nix
@@ -1,5 +1,6 @@
 { lib
 , buildPythonPackage
+, dlms-cosem
 , fetchFromGitHub
 , pyserial
 , pyserial-asyncio
@@ -11,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "dsmr-parser";
-  version = "0.33";
+  version = "0.34";
   format = "setuptools";
 
   disabled = pythonOlder "3.8";
@@ -20,10 +21,11 @@ buildPythonPackage rec {
     owner = "ndokter";
     repo = "dsmr_parser";
     rev = "v${version}";
-    sha256 = "sha256-Phx8Yqx6beTzkQv0fU8Pfs2btPgKVARdO+nMcne1S+w=";
+    sha256 = "sha256-GO+lSgTmFgi/ljt99mteoot+p5BJnGb6ZFky5I3I6Io=";
   };
 
   propagatedBuildInputs = [
+    dlms-cosem
     pyserial
     pyserial-asyncio
     pytz
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 04c9ec2047cb..c4714ffe9a52 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2620,6 +2620,8 @@ self: super: with self; {
 
   dlinfo = callPackage ../development/python-modules/dlinfo { };
 
+  dlms-cosem = callPackage ../development/python-modules/dlms-cosem { };
+
   dlx = callPackage ../development/python-modules/dlx { };
 
   dmenu-python = callPackage ../development/python-modules/dmenu { };