No, you can not.
You can not claim a spouse as a dependent.
See page 11 of IRS Publication 501 which says:
“Your spouse is never considered your dependent.”
You can find IRS Pub 501 at this link:
https://www.irs.gov/pub/irs-pdf/p501.pdfWhat you can do is to file as married filing jointly. You must report your wife's SS income on your joint return. Do not think that you can avoid tax on her SS by filing separately. There is a special rule if you are married and live together and file separately. That special rule requires the person getting SS to count the SS as gross income when deciding whether to file and 85% of their SS benefit becomes immediately taxable.
