I installed Sage 9.1 but my terminal says I have Sage 9.0 installed.

edit

Hello all, I just recently installed Sage 9.1 from a tar folder. It initially said I successfully installed Sage 9.1. After I closed the terminal and launched sage, the new terminal says it is sage 9.0. I tried installing Sage 9.0 before, but it never complied since I did not have the FORTRAN. I am not sure if that is creating a conflict. I am using Linux Mint 19.3 as my OS. I am relatively new to sage, so I might be wrong about the installation. Thank you for the help.

~$ sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 9.0, Release Date: 2020-01-01                     │
│ Using Python 3.7.3. Type "help()" for help.                        │
└────────────────────────────────────────────────────────────────────┘
sage: help()
Welcome to Sage 9.0!