Change Gravatar size for reviews section on single product in WooCommerce

functions.php

<?php
/**
 * Change Gravatar size for reviews
 */
function CUSTOM_woocommerce_review_display_gravatar( $comment ) {
		echo get_avatar( $comment, apply_filters( 'woocommerce_review_gravatar_size', '145' ), '' );
}
?>

hooks.php

<?php
// Remove default size
remove_action( 'woocommerce_review_before', 'woocommerce_review_display_gravatar', 10 );

// Add the new one
add_action( 'woocommerce_review_before', 'CUSTOM_woocommerce_review_display_gravatar', 10 );
?>