[ec2-user@ip-10-239-172-53 ~]$ sudo yum clean packages && sudo yum clean headers && sudo yum update Loaded plugins: amazon-id, rhui-lb, security Cleaning repos: pgdg94 rhui-REGION-client-config-server-6 rhui-REGION-rhel-server-releases rhui-REGION-rhel-server-releases-optional rhui-REGION-rhel-server-rh-common : rhui-REGION-rhel-server-rhscl 0 package files removed Loaded plugins: amazon-id, rhui-lb, security Cleaning repos: pgdg94 rhui-REGION-client-config-server-6 rhui-REGION-rhel-server-releases rhui-REGION-rhel-server-releases-optional rhui-REGION-rhel-server-rh-common : rhui-REGION-rhel-server-rhscl 0 header files removed Loaded plugins: amazon-id, rhui-lb, security Setting up Update Process Resolving Dependencies --> Running transaction check ---> Package libevent.x86_64 0:1.4.13-4.el6 will be updated --> Processing Dependency: libevent-1.4.so.2()(64bit) for package: 1:nfs-utils-1.2.3-39.el6.x86_64 ---> Package libevent.x86_64 0:2.0.19-1.rhel6 will be an update ---> Package libevent-devel.x86_64 0:1.4.13-4.el6 will be updated --> Processing Dependency: libevent-devel = 1.4.13-4.el6 for package: libevent-headers-1.4.13-4.el6.noarch --> Processing Dependency: libevent-devel = 1.4.13-4.el6 for package: libevent-doc-1.4.13-4.el6.noarch ---> Package libevent-devel.x86_64 0:2.0.19-1.rhel6 will be an update --> Running transaction check ---> Package compat-libevent14.x86_64 0:1.4.13-1.rhel6 will be installed ---> Package libevent-devel.i686 0:1.4.13-4.el6 will be installed --> Processing Dependency: libevent = 1.4.13-4.el6 for package: libevent-devel-1.4.13-4.el6.i686 --> Processing Dependency: libevent_extra-1.4.so.2 for package: libevent-devel-1.4.13-4.el6.i686 --> Processing Dependency: libevent_core-1.4.so.2 for package: libevent-devel-1.4.13-4.el6.i686 --> Processing Dependency: libevent-1.4.so.2 for package: libevent-devel-1.4.13-4.el6.i686 ---> Package libevent-devel.x86_64 0:1.4.13-4.el6 will be updated --> Running transaction check ---> Package libevent.i686 0:1.4.13-4.el6 will be installed --> Processing Dependency: librt.so.1(GLIBC_2.2) for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: librt.so.1 for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libresolv.so.2 for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libnsl.so.1 for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libc.so.6(GLIBC_2.4) for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libc.so.6(GLIBC_2.3.4) for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libc.so.6(GLIBC_2.3.2) for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libc.so.6(GLIBC_2.3) for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libc.so.6(GLIBC_2.1.3) for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libc.so.6(GLIBC_2.1) for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libc.so.6(GLIBC_2.0) for package: libevent-1.4.13-4.el6.i686 --> Processing Dependency: libc.so.6 for package: libevent-1.4.13-4.el6.i686 ---> Package libevent.x86_64 0:1.4.13-4.el6 will be updated ---> Package libevent.x86_64 0:1.4.13-4.el6 will be updated --> Running transaction check ---> Package glibc.i686 0:2.12-1.132.el6_5.2 will be installed --> Processing Dependency: libfreebl3.so(NSSRAWHASH_3.12.3) for package: glibc-2.12-1.132.el6_5.2.i686 --> Processing Dependency: libfreebl3.so for package: glibc-2.12-1.132.el6_5.2.i686 --> Running transaction check ---> Package nss-softokn-freebl.i686 0:3.14.3-10.el6_5 will be installed --> Finished Dependency Resolution Error: Multilib version problems found. This often means that the root cause is something else and multilib version checking is just pointing out that there is a problem. Eg.: 1. You have an upgrade for libevent-devel which is missing some dependency that another package requires. Yum is trying to solve this by installing an older version of libevent-devel of the different architecture. If you exclude the bad architecture yum will tell you what the root cause is (which package requires what). You can try redoing the upgrade with --exclude libevent-devel.otherarch ... this should give you an error message showing the root cause of the problem. 2. You have multiple architectures of libevent-devel installed, but yum can only see an upgrade for one of those arcitectures. If you don't want/need both architectures anymore then you can remove the one with the missing update and everything will work. 3. You have duplicate versions of libevent-devel installed already. You can use "yum check" to get yum show these errors. ...you can also use --setopt=protected_multilib=false to remove this checking, however this is almost never the correct thing to do as something else is very likely to go wrong (often causing much more problems). Protected multilib versions: libevent-devel-2.0.19-1.rhel6.x86_64 != libevent-devel-1.4.13-4.el6.i686 Error: Protected multilib versions: libevent-1.4.13-4.el6.i686 != libevent-2.0.19-1.rhel6.x86_64 You could try using --skip-broken to work around the problem You could try running: rpm -Va --nofiles --nodigest