Code to Completely Remove WordPress Version Numbers from CSS and JS

/* Remove Version Numbers Globally */
function wpflt_remove_version() {
    return '';
}
add_filter('the_generator', 'wpflt_remove_version');
function wpflt_remove_cssjs_versions( $src ) {
    if( strpos( $src, '?ver=' ) )
        $src = remove_query_arg( 'ver', $src );
    return $src;
}
add_filter( 'style_loader_src', 'wpflt_remove_cssjs_versions', 9999 );
add_filter( 'script_loader_src', 'wpflt_remove_cssjs_versions', 9999 );

Add this code to your child theme’s functions.php, to completely remove version numbers not only from WordPress but also from its CSS and JS.