Yep, crack down hard and make him feel like he has really made you ashamed. My son did that a bit in the beginning of 1st grade or the end of kindergarten and it was for ridiculous things that he would totally get caught for because he left evidence. Why lie when it's so obvious that you did it?? Other times he was trying to avoid punishment from one parent. We would tell him that the punishment for lying was far worse that the "possible" punishment. Sometimes you may not even get punished if you tell the truth. We gave lots of examples of telling the truth and rewarded verbally and sometimes otherwise when he would tell the truth. That's a major part, make a big deal when they do the right thing.
Good luck and I hope it gets better.
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