Generally, you'll need to replace all the places your prior IP address/subnet are referenced with your new IP address/subnet and possibly doing likewise for your next-hop outbound address/subnetwork.
For starters, you would need to revise the IP address statement on your WAN facing interface. You'll probably also have a default route statement that will need to be revised.
From your second posting, it looks like you're using 192.168.40.65 for your LAN facing interface. If so, I would suppose, as is usually the case, you're using private IP addressing internally, which generally implies your doing NAT/PAT between your internal private IP addressing and the public IP addressing of the Internet. That will need revision too.
You might also have a FW feature set and/or ACLs that might need revision too.
The foregoing probably addresses (pun not intended - laugh) all related changes needed when changing your public IP, but if you prior external IP was a DHCP address, or the new now is, you'll need to look for DHCP references in addition to actual external old/new IP addresses (and subnets).
