diff --git a/server/alembic/env.py b/server/alembic/env.py
index 687d8b62..d0786a16 100644
--- a/server/alembic/env.py
+++ b/server/alembic/env.py
@@ -46,7 +46,7 @@ def run_migrations_offline():
     """
     url = config.get_main_option("sqlalchemy.url")
     context.configure(
-        url=url, target_metadata=target_metadata, literal_binds=True
+        url=url, target_metadata=target_metadata, literal_binds=True, compare_type=True
     )
 
     with context.begin_transaction():
@@ -68,7 +68,7 @@ def run_migrations_online():
 
     with connectable.connect() as connection:
         context.configure(
-            connection=connection, target_metadata=target_metadata
+            connection=connection, target_metadata=target_metadata, compare_type=True
         )
 
         with context.begin_transaction():
diff --git a/server/alembic/versions/777453724560_change_dataset_title_length.py b/server/alembic/versions/777453724560_change_dataset_title_length.py
new file mode 100644
index 00000000..50bc9fbc
--- /dev/null
+++ b/server/alembic/versions/777453724560_change_dataset_title_length.py
@@ -0,0 +1,34 @@
+"""change dataset title length
+
+Revision ID: 777453724560
+Revises: bad466dcd0cd
+Create Date: 2021-01-29 04:06:38.055487
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision = '777453724560'
+down_revision = 'bad466dcd0cd'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('data_sets', 'title',
+               existing_type=mysql.VARCHAR(collation='utf8mb4_bin', length=32),
+               type_=sa.String(length=64),
+               existing_nullable=False)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('data_sets', 'title',
+               existing_type=sa.String(length=64),
+               type_=mysql.VARCHAR(collation='utf8mb4_bin', length=32),
+               existing_nullable=False)
+    # ### end Alembic commands ###
diff --git a/server/dbcls/api/resources/data_set.py b/server/dbcls/api/resources/data_set.py
index 0b3bacc1..7f9242eb 100644
--- a/server/dbcls/api/resources/data_set.py
+++ b/server/dbcls/api/resources/data_set.py
@@ -238,7 +238,7 @@ def patch(self, id):
 
         # DataSet更新
         if args.get('title') is not None:
-            data_set.title = args['title'][:32]
+            data_set.title = args['title'][:64]
         if args.get('is_public') is not None:
             data_set.is_public = args['is_public']
         db.session.add(data_set)
diff --git a/server/dbcls/models.py b/server/dbcls/models.py
index 043a296a..fba038e0 100644
--- a/server/dbcls/models.py
+++ b/server/dbcls/models.py
@@ -16,7 +16,6 @@ class User(db.Model):
     firebase_uid = db.Column(db.String(255), unique=True, nullable=False)
     display_name = db.Column(db.String(30), default='', nullable=False)
     contact_uri = db.Column(db.String(255), default='', nullable=False)
-
     def __repr__(self):
         return f'<User id={self.id} firebase_uid={self.firebase_uid}>'
 
@@ -60,7 +59,7 @@ class DataSet(db.Model):
 
     id = db.Column(db.Integer, primary_key=True)
     user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
-    title = db.Column(db.String(32), default='', nullable=False)
+    title = db.Column(db.String(64), default='', nullable=False)
     path = db.Column(db.String(255), unique=True, nullable=False)
     content = deferred(db.Column(db.JSON))
     upload_at = db.Column(db.DateTime, nullable=False)