diff --git a/common/protob/pb2py b/common/protob/pb2py
index aab8cc86a..d2c7f92d4 100755
--- a/common/protob/pb2py
+++ b/common/protob/pb2py
@@ -10,16 +10,14 @@ import shutil
 import subprocess
 import sys
 import tempfile
+from dataclasses import dataclass
 from pathlib import Path
-
 from typing import List, Optional
 
-import attr
 import click
 import construct as c
 import mako
 import mako.template
-
 from google.protobuf import descriptor_pb2
 
 FieldDescriptor = descriptor_pb2.FieldDescriptorProto
@@ -140,7 +138,7 @@ QDEF_RE = re.compile(
 )
 
 
-@attr.s(auto_attribs=True)
+@dataclass
 class ProtoField:
     name: str
     number: int
@@ -229,7 +227,7 @@ class ProtoField:
         )
 
 
-@attr.s(auto_attribs=True)
+@dataclass
 class ProtoMessage:
     name: str
     wire_type: Optional[int]
diff --git a/pyproject.toml b/pyproject.toml
index 3774de16c..2029d36bc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,7 +67,6 @@ setuptools = ">=24.2.0"
 # storage
 cryptography = "*"
 hypothesis = "*"
-attrs = "*"
 inotify = "*"
 yamllint = "^1.25.0"
 
diff --git a/python/requirements.txt b/python/requirements.txt
index 9b4ffe82e..191186e85 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -5,4 +5,4 @@ click>=7,<9
 libusb1>=1.6.4
 construct>=2.9,!=2.10.55
 typing_extensions>=3.7.4
-attrs
+dataclasses ; python_version<'3.7'
diff --git a/python/setup.cfg b/python/setup.cfg
index 86c820791..5dcfcaacb 100644
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -25,7 +25,7 @@ per-file-ignores =
     helper-scripts/*:I
     tools/*:I
     tests/*:I
-known-modules = libusb1:[usb1],hidapi:[hid],attrs:[attr],PyQt5:[PyQt5.QtWidgets,PyQt5.QtGui,PyQt5.QtCore]
+known-modules = libusb1:[usb1],hidapi:[hid],PyQt5:[PyQt5.QtWidgets,PyQt5.QtGui,PyQt5.QtCore]
 
 [isort]
 multi_line_output = 3
diff --git a/python/setup.py b/python/setup.py
index 0c030a05f..0e6af3b9d 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -13,7 +13,7 @@ install_requires = [
     "libusb1>=1.6.4",
     "construct>=2.9",
     "typing_extensions>=3.7.4",
-    "attrs",
+    "dataclasses ; python_version<'3.7'",
 ]
 
 extras_require = {
diff --git a/python/src/trezorlib/protobuf.py b/python/src/trezorlib/protobuf.py
index e2dd2aa71..e50b6e140 100644
--- a/python/src/trezorlib/protobuf.py
+++ b/python/src/trezorlib/protobuf.py
@@ -24,12 +24,12 @@ For serializing (dumping) protobuf types, object with `Writer` interface is requ
 
 import logging
 import warnings
+from dataclasses import dataclass
 from enum import IntEnum
 from io import BytesIO
 from itertools import zip_longest
 from typing import Any, Dict, List, Optional, Type, TypeVar, Union
 
-import attr
 from typing_extensions import Protocol
 
 MT = TypeVar("MT", bound="MessageType")
@@ -141,13 +141,13 @@ WIRE_TYPES = {
 REQUIRED_FIELD_PLACEHOLDER = object()
 
 
-@attr.s(auto_attribs=True)
+@dataclass
 class Field:
     name: str
     type: str
-    repeated: bool = attr.ib(default=False)
-    required: bool = attr.ib(default=False)
-    default: object = attr.ib(default=None)
+    repeated: bool = False
+    required: bool = False
+    default: object = None
 
     @property
     def wire_type(self) -> int:
diff --git a/python/src/trezorlib/toif.py b/python/src/trezorlib/toif.py
index 49ff8f810..9db615838 100644
--- a/python/src/trezorlib/toif.py
+++ b/python/src/trezorlib/toif.py
@@ -1,9 +1,8 @@
 import struct
 import zlib
+from dataclasses import dataclass
 from typing import Sequence, Tuple
 
-import attr
-
 from . import firmware
 
 try:
@@ -61,14 +60,14 @@ def _to_grayscale(data: bytes) -> bytes:
     return bytes(res)
 
 
-@attr.s
+@dataclass
 class Toif:
-    mode: firmware.ToifMode = attr.ib()
-    size: Tuple[int, int] = attr.ib()
-    data: bytes = attr.ib()
+    mode: firmware.ToifMode
+    size: Tuple[int, int]
+    data: bytes
 
-    @data.validator
-    def check_data_size(self, _, value):
+    def __post_init__(self) -> None:
+        # checking the data size
         width, height = self.size
         if self.mode is firmware.ToifMode.grayscale:
             expected_size = width * height // 2