diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index a8da3bf..eab6a47 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+0.2.2 (2022-10-07)
+------------------
+
+- attribute default namespace bug fixed.
+
 
 0.2.1 (2022-10-06)
 ------------------
diff --git a/pydantic_xml/serializers.py b/pydantic_xml/serializers.py
index ce27d01..9b8316d 100644
--- a/pydantic_xml/serializers.py
+++ b/pydantic_xml/serializers.py
@@ -221,7 +221,7 @@ def __init__(
             ns = ctx.entity_ns or (ctx.parent_ns if ns_attrs else None)
             nsmap = ctx.parent_nsmap
 
-            self.attr_name = QName.from_alias(tag=name, ns=ns, nsmap=nsmap).uri
+            self.attr_name = QName.from_alias(tag=name, ns=ns, nsmap=nsmap, is_attr=True).uri
 
         def serialize(
                 self, element: etree.Element, value: Any, *, encoder: XmlEncoder, skip_empty: bool = False,
diff --git a/pydantic_xml/utils.py b/pydantic_xml/utils.py
index 1c9bbc3..b40ba38 100644
--- a/pydantic_xml/utils.py
+++ b/pydantic_xml/utils.py
@@ -35,17 +35,23 @@ def from_uri(cls, uri: str) -> 'QName':
         return cls(tag=m[3], ns=m[2])
 
     @classmethod
-    def from_alias(cls, tag: str, ns: Optional[str] = None, nsmap: Optional[NsMap] = None) -> 'QName':
+    def from_alias(
+            cls, tag: str, ns: Optional[str] = None, nsmap: Optional[NsMap] = None, is_attr: bool = False,
+    ) -> 'QName':
         """
         Creates `QName` from namespace alias.
 
         :param tag: entity tag
         :param ns: xml namespace alias
         :param nsmap: xml namespace mapping
+        :param is_attr: is the tag of attribute type
         :return: qualified name
         """
 
-        return QName(tag=tag, ns=nsmap.get(ns or '') if nsmap else None)
+        if not is_attr or ns is not None:
+            ns = nsmap.get(ns or '') if nsmap else None
+
+        return QName(tag=tag, ns=ns)
 
     @property
     def uri(self) -> str:
diff --git a/pyproject.toml b/pyproject.toml
index d784b18..f95e20c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pydantic-xml"
-version = "0.2.1"
+version = "0.2.2"
 description = "pydantic xml serialization/deserialization extension"
 authors = ["Dmitry Pershin <dapper1291@gmail.com>"]
 license = "Unlicense"
diff --git a/tests/test_namespaces.py b/tests/test_namespaces.py
index ae36be6..b444666 100644
--- a/tests/test_namespaces.py
+++ b/tests/test_namespaces.py
@@ -7,7 +7,9 @@
 
 
 def test_default_namespaces():
-    class TestSubMode2(BaseXmlModel):
+    class TestSubMode2(BaseXmlModel, nsmap={'tst': 'http://test3.org'}):
+        attr1: int = attr()
+        attr2: int = attr(ns='tst')
         element: str = element()
 
     class TestSubModel1(BaseXmlModel):
@@ -19,7 +21,7 @@ class TestModel(BaseXmlModel, tag='model'):
     xml = '''
     <model>
         <submodel1 xmlns="http://test1.org">
-            <submodel2 xmlns="http://test2.org">
+            <submodel2 xmlns="http://test2.org" xmlns:tst="http://test3.org" attr1="1" tst:attr2="2">
                 <element>value</element>
             </submodel2>
         </submodel1>
@@ -28,7 +30,7 @@ class TestModel(BaseXmlModel, tag='model'):
 
     actual_obj = TestModel.from_xml(xml)
     expected_obj = TestModel(
-        submodel1=TestSubModel1(submodel2=TestSubMode2(element='value')),
+        submodel1=TestSubModel1(submodel2=TestSubMode2(element='value', attr1=1, attr2=2)),
     )
 
     assert actual_obj == expected_obj