diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44fcd779..6d856014 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,5 @@
+* Fixed python2 compatibility 
+
 ## 2.15.0 ##
 * Fixed python2 compatibility
 
diff --git a/ydb/_errors.py b/ydb/_errors.py
index e7524e5a..84ac23db 100644
--- a/ydb/_errors.py
+++ b/ydb/_errors.py
@@ -1,5 +1,3 @@
-from dataclasses import dataclass
-
 from . import issues
 
 _errors_retriable_fast_backoff_types = [
@@ -56,7 +54,6 @@ def check_retriable_error(err, retry_settings, attempt):
     return ErrorRetryInfo(False, None)
 
 
-@dataclass
 class ErrorRetryInfo:
     def __init__(self, is_retriable, sleep_timeout_seconds=None):
         self.is_retriable = is_retriable
diff --git a/ydb/scheme.py b/ydb/scheme.py
index 88eca78c..4e8b716d 100644
--- a/ydb/scheme.py
+++ b/ydb/scheme.py
@@ -25,10 +25,6 @@ class SchemeEntryType(enum.IntEnum):
     REPLICATION = 16
     TOPIC = 17
 
-    @classmethod
-    def _missing_(cls, value):
-        return cls.TYPE_UNSPECIFIED
-
     @staticmethod
     def is_table(entry):
         """