diff --git a/migrations/versions/initial_products_table.py b/migrations/versions/initial_products_table.py
index 8100d0c..ec034f0 100644
--- a/migrations/versions/initial_products_table.py
+++ b/migrations/versions/initial_products_table.py
@@ -24,10 +24,10 @@ def upgrade():
         sa.Column('description', sa.Text(), nullable=True),
         sa.Column('price', sa.Float(), nullable=False),
         sa.Column('sku', sa.String(length=50), nullable=False),
-        sa.Column('stock', sa.Integer(), nullable=True, default=0),
+        sa.Column('stock', sa.Integer(), nullable=True, server_default='0'),
         sa.Column('category', sa.String(length=50), nullable=True),
-        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
-        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
+        sa.Column('created_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=True),
         sa.PrimaryKeyConstraint('id')
     )
     op.create_index(op.f('ix_products_id'), 'products', ['id'], unique=False)