diff --git a/alembic/versions/003_add_user_invitation_fields.py b/alembic/versions/003_add_user_invitation_fields.py
index 06a0ad2..4c91a11 100644
--- a/alembic/versions/003_add_user_invitation_fields.py
+++ b/alembic/versions/003_add_user_invitation_fields.py
@@ -22,11 +22,24 @@ depends_on: Union[str, Sequence[str], None] = None
 
 
 def upgrade() -> None:
-    """Add optional pre-filled information fields to user_invitations"""
+    """Add optional pre-filled information fields to user_invitations (skip if already exists)"""
+    from sqlalchemy import inspect
 
-    op.add_column('user_invitations', sa.Column('first_name', sa.String(), nullable=True))
-    op.add_column('user_invitations', sa.Column('last_name', sa.String(), nullable=True))
-    op.add_column('user_invitations', sa.Column('phone', sa.String(), nullable=True))
+    conn = op.get_bind()
+    inspector = inspect(conn)
+    existing_columns = {col['name'] for col in inspector.get_columns('user_invitations')}
+
+    # Add first_name if missing
+    if 'first_name' not in existing_columns:
+        op.add_column('user_invitations', sa.Column('first_name', sa.String(), nullable=True))
+
+    # Add last_name if missing
+    if 'last_name' not in existing_columns:
+        op.add_column('user_invitations', sa.Column('last_name', sa.String(), nullable=True))
+
+    # Add phone if missing
+    if 'phone' not in existing_columns:
+        op.add_column('user_invitations', sa.Column('phone', sa.String(), nullable=True))
 
 
 def downgrade() -> None: