Mini cart in header using divi is not getting updated on changing the cart items count:

I fixed the issue by adding the below in my functions.php:

add_filter( 'woocommerce_add_to_cart_fragments', 'your_custom_functions', 10, 1 ); 

function your_custom_functions( $fragments ) {
    $fragments['.your_cart_class'] = '' . WC()->cart->get_cart_contents_count() . ' Items';
    return $fragments; 
}