I bought a lamp which has a maximum of 40 WATTS coltage for a light bulb. Will a 42 W damage it?

I bought a lamp for my bedroom and it says on it MAXIMUM 40 WATT LIGHT BULB. I bough 42 WATT bulbs by accident, should I exchange the light bulbs to be on the safe side or will they not damage the lamp?

- Thankyou.
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