You can update the Open SSH client on the Linux server [Tested on CentOS] to 5.xx with following steps::
Login to server with root

wget http://ftp.ini.uzh.ch/pub/OpenBSD/Op...h-5.8p1.tar.gz
gunzip openssh-5.8p1.tar.gz
cd /usr/local/src/openssl-1.0.0d
../config
make
make test
make install
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rpm -qa | grep openssh
ssh -V


Now you should have latest Open SSH client on the server