How to change WooCommerce products title tag

// Change WooCommerce Products title <h2> tags to <h3>
// For more info visit https://fahimm.com
if ( ! function_exists( 'woocommerce_template_loop_product_title' ) ) {

/**
* Show the product title in the product loop. By default this is an H2.
*/
    function woocommerce_template_loop_product_title() {
        echo '<h3 class="woocommerce-loop-product__title">' . get_the_title() . '</h3>';
    }
}

// If that code does not work try this
if ( ! function_exists( 'woocommerce_template_single_title' ) ) {

       function woocommerce_template_single_title() {
        echo '<h3 class="woocommerce-product-title">' . get_the_title() . '</h3>';
    }
}