diff --git a/api/db/db_models.py b/api/db/db_models.py
index 555f734455..433ed78afe 100644
--- a/api/db/db_models.py
+++ b/api/db/db_models.py
@@ -899,7 +899,7 @@ class Document(DataBaseModel):
     created_by = CharField(max_length=32, null=False, help_text="who created it", index=True)
     name = CharField(max_length=255, null=True, help_text="file name", index=True)
     location = CharField(max_length=255, null=True, help_text="where dose it store", index=True)
-    size = IntegerField(default=0, index=True)
+    size = BigIntegerField(default=0, index=True)
     token_num = IntegerField(default=0, index=True)
     chunk_num = IntegerField(default=0, index=True)
     progress = FloatField(default=0, index=True)
@@ -924,7 +924,7 @@ class File(DataBaseModel):
     created_by = CharField(max_length=32, null=False, help_text="who created it", index=True)
     name = CharField(max_length=255, null=False, help_text="file name or folder name", index=True)
     location = CharField(max_length=255, null=True, help_text="where dose it store", index=True)
-    size = IntegerField(default=0, index=True)
+    size = BigIntegerField(default=0, index=True)
     type = CharField(max_length=32, null=False, help_text="file extension", index=True)
     source_type = CharField(max_length=128, null=False, default="", help_text="where dose this document come from", index=True)
 
@@ -1648,6 +1648,8 @@ def migrate_db():
     alter_db_add_column(migrator, "memory", "tenant_llm_id", IntegerField(null=True, help_text="id in tenant_llm", index=True))
     alter_db_add_column(migrator, "user_canvas_version", "release", BooleanField(null=False, help_text="is released", default=False, index=True))
     alter_db_add_column(migrator, "api_4_conversation", "version_title", CharField(max_length=255, null=True, help_text="canvas version title when session created", index=False))
+    alter_db_column_type(migrator, "document", "size", BigIntegerField(default=0, index=True))
+    alter_db_column_type(migrator, "file", "size", BigIntegerField(default=0, index=True))
     logging.disable(logging.NOTSET)
     # this is after re-enabling logging to allow logging changed user emails
     migrate_add_unique_email(migrator)