diff --git a/pkgs/development/python-modules/construct-classes/default.nix b/pkgs/development/python-modules/construct-classes/default.nix
new file mode 100644
index 000000000000..479f0703118f
--- /dev/null
+++ b/pkgs/development/python-modules/construct-classes/default.nix
@@ -0,0 +1,41 @@
+{ lib
+, stdenv
+, buildPythonPackage
+, fetchFromGitHub
+, poetry-core
+, construct
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname   = "construct-classes";
+  version = "0.1.2";
+  format = "pyproject";
+
+  # no tests in PyPI tarball
+  src = fetchFromGitHub {
+    owner  = "matejcik";
+    repo   = "construct-classes";
+    rev    = "v${version}";
+    sha256 = "sha256-l4sVacKTuQbhXCw2lVHCl1OzpCiKmEAm9nSQ8pxFuTo=";
+  };
+
+  nativeBuildInputs = [
+    poetry-core
+  ];
+
+  propagatedBuildInputs = [
+    construct
+  ];
+
+  checkInputs = [ pytestCheckHook ];
+
+  pythonImportsCheck = [ "construct_classes" ];
+
+  meta = with lib; {
+    description = "Parse your binary data into dataclasses.";
+    homepage = "https://github.com/matejcik/construct-classes";
+    license = licenses.mit;
+    maintainers = with maintainers; [ prusnak ];
+  };
+}
diff --git a/pkgs/development/python-modules/trezor/default.nix b/pkgs/development/python-modules/trezor/default.nix
index b4a2925a4155..ae9778d91039 100644
--- a/pkgs/development/python-modules/trezor/default.nix
+++ b/pkgs/development/python-modules/trezor/default.nix
@@ -7,6 +7,7 @@
 , attrs
 , click
 , construct
+, construct-classes
 , ecdsa
 , hidapi
 , libusb1
@@ -24,13 +25,13 @@
 
 buildPythonPackage rec {
   pname = "trezor";
-  version = "0.13.3";
+  version = "0.13.4";
 
   disabled = !isPy3k;
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "055d32174d4ecf2353f7622ee44b8e82e3bef78fe40ce5cdbeafc785b422a049";
+    sha256 = "04a77b44005971819386bbd55242a1004b1f88fbbdb829deb039a1e0028a4af1";
   };
 
   nativeBuildInputs = [ installShellFiles ];
@@ -39,6 +40,7 @@ buildPythonPackage rec {
     attrs
     click
     construct
+    construct-classes
     ecdsa
     hidapi
     libusb1
@@ -58,6 +60,7 @@ buildPythonPackage rec {
 
   disabledTestPaths = [
     "tests/test_stellar.py" # requires stellar-sdk
+    "tests/test_firmware.py" # requires network downloads
   ];
 
   pythonImportsCheck = [ "trezorlib" ];
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 6e5648173dd1..3810767e7d2a 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1928,6 +1928,8 @@ self: super: with self; {
 
   construct = callPackage ../development/python-modules/construct { };
 
+  construct-classes = callPackage ../development/python-modules/construct-classes { };
+
   consul = callPackage ../development/python-modules/consul { };
 
   container-inspector = callPackage ../development/python-modules/container-inspector { };