Check what the latest version are from GoLang:
Download and install (update the version to the latest):
wget https://storage.googleapis.com/golang/go1.5.linux-amd64.tar.gz
sudo tar -C /usr/local -xzf go1.5.linux-amd64.tar.gz
Add /usr/local/lib/go/bin to the PATH environment variable. You can do this by adding this line to your /etc/.profile (for a system-wide installation) or $HOME/.profile:
export GOROOT=/usr/local/go
export PATH=$GOROOT/bin:$PATH
To remove an older version of Golang:
sudo rm -rf /usr/local/go
Links