Dependencies error on RHEL 6.4

Hi there !

We're currently using a RHEL 6.4 EUS system (up to date) with postgresql,
today we tried to migrate to the last available version on the yum
repository ( http://yum.postgresql.org/8.4/redhat/rhel-6.4-x86_64 ) but it
failed.

It seems the dependencies for postgresql84-server-8.4.21-1PGDG.rhel6.x86_64
cannot be met on our system.

Loaded plugins: security, tmprepo, versionlock
> Setting up Update Process
> Resolving Dependencies
> --> Running transaction check
> ---> Package postgresql84.x86_64 0:8.4.18-1PGDG.rhel6 will be updated
> --> Processing Dependency: postgresql84 = 8.4.18-1PGDG.rhel6 for package:
> postgresql84-server-8.4.18-1PGDG.rhel6.x86_64
> ---> Package postgresql84.x86_64 0:8.4.21-1PGDG.rhel6 will be an update
> --> Processing Dependency: postgresql84-libs = 8.4.21-1PGDG.rhel6 for
> package: postgresql84-8.4.21-1PGDG.rhel6.x86_64
> --> Processing Dependency: libssl.so.10(libssl.so.10)(64bit) for package:
> postgresql84-8.4.21-1PGDG.rhel6.x86_64
> --> Running transaction check
> ---> Package postgresql84.x86_64 0:8.4.21-1PGDG.rhel6 will be an update
> --> Processing Dependency: libssl.so.10(libssl.so.10)(64bit) for package:
> postgresql84-8.4.21-1PGDG.rhel6.x86_64
> ---> Package postgresql84-libs.x86_64 0:8.4.18-1PGDG.rhel6 will be updated
> ---> Package postgresql84-libs.x86_64 0:8.4.21-1PGDG.rhel6 will be an
> update
> --> Processing Dependency: libssl.so.10(libssl.so.10)(64bit) for package:
> postgresql84-libs-8.4.21-1PGDG.rhel6.x86_64
> --> Processing Dependency: libcrypto.so.10(libcrypto.so.10)(64bit) for
> package: postgresql84-libs-8.4.21-1PGDG.rhel6.x86_64
> ---> Package postgresql84-server.x86_64 0:8.4.18-1PGDG.rhel6 will be
> updated
> ---> Package postgresql84-server.x86_64 0:8.4.21-1PGDG.rhel6 will be an
> update
> --> Processing Dependency: libssl.so.10(libssl.so.10)(64bit) for package:
> postgresql84-server-8.4.21-1PGDG.rhel6.x86_64
> --> Processing Dependency: libcrypto.so.10(libcrypto.so.10)(64bit) for
> package: postgresql84-server-8.4.21-1PGDG.rhel6.x86_64
> --> Finished Dependency Resolution
> Error: Package: postgresql84-server-8.4.21-1PGDG.rhel6.x86_64
> (PostgreSQL-8.4)
> Requires: libssl.so.10(libssl.so.10)(64bit)
> Error: Package: postgresql84-libs-8.4.21-1PGDG.rhel6.x86_64
> (PostgreSQL-8.4)
> Requires: libcrypto.so.10(libcrypto.so.10)(64bit)
> Error: Package: postgresql84-8.4.21-1PGDG.rhel6.x86_64 (PostgreSQL-8.4)
> Requires: libssl.so.10(libssl.so.10)(64bit)
> Error: Package: postgresql84-libs-8.4.21-1PGDG.rhel6.x86_64
> (PostgreSQL-8.4)
> Requires: libssl.so.10(libssl.so.10)(64bit)
> Error: Package: postgresql84-server-8.4.21-1PGDG.rhel6.x86_64
> (PostgreSQL-8.4)
> Requires: libcrypto.so.10(libcrypto.so.10)(64bit)
> You could try using --skip-broken to work around the problem
> You could try running: rpm -Va --nofiles --nodigest

Our Openssl version is :

> # rpm -qa|grep openssl
> openssl-1.0.0-27.el6_4.2.x86_64
> openssl-devel-1.0.0-27.el6_4.2.x86_64

This version is containing the required files but I could not get
postgresql84-server updated.

Any lead on the how or why of all this ?

Regards,

Benoit BARTHELEMY