diff --git a/requirements.txt b/requirements.txt
index b1b83a0..86df8dd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,2 @@
-attrs==23.1.0
 numpy==1.26.1
 opencv-python==4.8.1.78
diff --git a/src/arcaea_offline_ocr/b30/shared.py b/src/arcaea_offline_ocr/b30/shared.py
index 87e1afc..312b803 100644
--- a/src/arcaea_offline_ocr/b30/shared.py
+++ b/src/arcaea_offline_ocr/b30/shared.py
@@ -1,10 +1,9 @@
+from dataclasses import dataclass
 from datetime import datetime
 from typing import Optional
 
-import attrs
 
-
-@attrs.define
+@dataclass
 class B30OcrResultItem:
     rating_class: int
     score: int
diff --git a/src/arcaea_offline_ocr/device/common.py b/src/arcaea_offline_ocr/device/common.py
index 9cdc076..a67c924 100644
--- a/src/arcaea_offline_ocr/device/common.py
+++ b/src/arcaea_offline_ocr/device/common.py
@@ -1,9 +1,8 @@
+from dataclasses import dataclass
 from typing import Optional
 
-import attrs
 
-
-@attrs.define
+@dataclass
 class DeviceOcrResult:
     rating_class: int
     pure: int