Omeka 2.1.4 error: Deprecated: iconv_set_encoding()

I noticed the following error on a client site that hasn't been updated in a while and I'm wondering if having them update will fix the problem or if it's a server-level issue. Any advice would be appreciated. Thanks!

Deprecated: iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /path/to/application/libraries/Zend/Validate/Hostname.php on line 553

Here's the system info:

Omeka	2.1.4
PHP	5.6.17 (cgi-fcgi)
OS	Linux 3.12.52-20160119.106.ELK6.x86_64 x86_64
MySQL Server	5.5.42
MySQL Client	5.5.42-37.1

PHP Extensions
Regular	bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dba, dom, enchant, ereg, exif, fileinfo, filter, ftp, gd, gettext, hash, iconv, imagick, imap, intl, ionCube Loader, json, libxml, magickwand, mailparse, mbstring, mcrypt, mhash, mysql, mysqli, mysqlnd, OAuth, oci8, odbc, openssl, pcre, PDO, pdo_dblib, pdo_mysql, PDO_ODBC, pdo_pgsql, pdo_sqlite, Phar, posix, pspell, Reflection, session, SimpleXML, snmp, soap, sockets, SourceGuardian, SPL, sqlite3, standard, tidy, tokenizer, uploadprogress, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend Guard Loader, Zend OPcache, zip, zlib
Zend	SourceGuardian, the ionCube PHP Loader (enabled) + Intrusion Protection from (unconfigured), Zend Guard Loader, Zend OPcache

The problem should be resolved by upgrading Omeka, yes. The versions of Zend Framework used in Omeka 2.2 and newer don't cause this problem.