Step 1:

Click APPlE button and go to System Preferences….

Step 2:

Click Network.

Step 3:

Click on Wi-Fi or Ethernet (Depends on which one is used) in the left side box, and click Advanced on the right side corner.

Step 4:

In the top options, select TCP/IP. If you get IP by Using DHCP, you can see Renew DHCP Lease button. Click it to renew the IP address.