diff --git a/aliases/sakuragasaki46_suou/pyproject.toml b/aliases/sakuragasaki46_suou/pyproject.toml
index 6764e6f..39ad228 100644
--- a/aliases/sakuragasaki46_suou/pyproject.toml
+++ b/aliases/sakuragasaki46_suou/pyproject.toml
@@ -10,7 +10,7 @@ license = "Apache-2.0"
 readme = "README.md"
 
 dependencies = [
-    "suou==0.7.7",
+    "suou==0.8.0",
     "itsdangerous",
     "toml",
     "pydantic",
diff --git a/src/suou/__init__.py b/src/suou/__init__.py
index a0f3a65..342e5c7 100644
--- a/src/suou/__init__.py
+++ b/src/suou/__init__.py
@@ -37,7 +37,7 @@ from .redact import redact_url_password
 from .http import WantsContentType
 from .color import chalk
 
-__version__ = "0.8.0"
+__version__ = "0.8.1"
 
 __all__ = (
     'ConfigOptions', 'ConfigParserConfigSource', 'ConfigSource', 'ConfigValue',
diff --git a/src/suou/sqlalchemy/orm.py b/src/suou/sqlalchemy/orm.py
index 9e0ee91..05271eb 100644
--- a/src/suou/sqlalchemy/orm.py
+++ b/src/suou/sqlalchemy/orm.py
@@ -255,6 +255,8 @@ def unbound_fk(target: str | Column | InstrumentedAttribute, typ: _T | None = No
         target_name = target
         if typ is None:
             typ = IdType
+    else:
+        raise TypeError('target must be a str, a Column or a InstrumentedAttribute')
 
     return Column(typ, ForeignKey(target_name, ondelete='SET NULL'), nullable=True, **kwargs)
 
@@ -276,6 +278,8 @@ def bound_fk(target: str | Column | InstrumentedAttribute, typ: _T = None, **kwa
         target_name = target
         if typ is None:
             typ = IdType
+    else:
+        raise TypeError('target must be a str, a Column or a InstrumentedAttribute')
 
     return Column(typ, ForeignKey(target_name, ondelete='CASCADE'), nullable=False, **kwargs)