Roundcube is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an email client, including MIME support, address book, folder manipulation, message searching and spell checking.
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1) Login to SSH (Using putty)
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2) Backup old roundcube configuration.
mkdir /home/roundcube_backup
cp -R /usr/local/apache/htdocs/roundcube/* /home/roundcube_backup
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3) Download latest version of roundcube.
wget https://downloads.sourceforge.net/project/roundcubemail/roundcubemail/1.1.3/roundcubemail-1.1.3.tar.gz
tar zxvf roundcubemail-1.1.3.tar.gz
cd roundcubemail-1.1.3
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4) Proceed with the installation
bin/installto.sh /usr/local/apache/htdocs/roundcube
Press "y"

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Press "y"

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5) Change to correct permission.
chown -R nobody:nobody /usr/local/apache/htdocs/roundcube