libssl.so.6 not found

When I attempt to install the RHEL 5 RPM of Percona Xtrabackup 2.1.3 on our server, I get the following error:

libssl.so.6()(64bit) is needed by percona-xtrabackup-2.1.3-608.rhel5.x86_64

Right now I have version 0.9.8j-0.24.1 of the OpenSSL package installed.

Is there anyway to get this version of Percona Xtrabackup to work with this version of OpenSSL?