# Fedora Docs Authors - DNF System Upgrade (Highlights) ![rw-book-cover|256](https://docs.fedoraproject.org/en-US/_/img/docs_logo.png) ## Highlights ### [](https://docs.fedoraproject.org/en-US/quick-docs/dnf-system-upgrade#sect-performing-system-upgrade)Performing system upgrade #### [](https://docs.fedoraproject.org/en-US/quick-docs/dnf-system-upgrade#sect-clean-up-old-symlinks)Clean-up old symlinks - sudo symlinks -r /usr | grep dangling ([View Highlight](https://read.readwise.io/read/01gxr9b1y180dgf56qq658mepa)) ^507387147 #code - sudo symlinks -r -d /usr ([View Highlight](https://read.readwise.io/read/01gxr9bdvz47v1pw6w5gt2d9es)) ^507387418 #code