Hi, Here's a list of upgrade options from SL 6.0 to SL 6.1. Option 1: similar to RHEL / CentOS for i386 and x86_64: yum install yum-conf-sl6x yum clean all yum update Option 2: Scientific Linux way i386: rpm -Uvh http://ftp.scientificlinux.org/linux/scientific/6.1/i386/os/Packages/sl-release-6.1-2.i686.rpm yum clean all yum update x86_64: rpm -Uvh http://ftp.scientificlinux.org/linux/scientific/6.1/x86_64/os/Packages/sl-release-6.1-2.x86_64.rpm yum clean all yum update That's it. Additional for sl-fastbugs, sl-testing, and sl-debuginfo (optional): yum install yum-conf-sl-other Best regards, Morten