Yes God says He changed His mind well over a dozen times in scripture as
@TomL posted all the scriptures that verify God repented , changed His mind with what He says was going to happen.
This proves the future is not fixed since God did not do what Ge said He would do.
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Warren McGrew in a debate with Tyler Vela rebuts the idea God cannot change his mind
As
Jeremiah 18:7–10 (KJV 1900) — 7 At what instant I shall speak concerning a nation, and concerning a kingdom, to pluck up, and to pull down, and to destroy it; 8 If that nation, against whom I have pronounced, turn from their evil, I will repent of the evil that I thought to do unto them. 9 And at what instant I shall speak concerning a nation, and concerning a kingdom, to build and to plant it; 10 If it do evil in my sight, that it obey not my voice, then I will repent of the good, wherewith I said I would benefit them.
Jeremiah 18:7–11 (ESV) — 7 If at any time I declare concerning a nation or a kingdom, that I will pluck up and break down and destroy it, 8 and if that nation, concerning which I have spoken, turns from its evil, I will relent of the disaster that I intended to do to it. 9 And if at any time I declare concerning a nation or a kingdom that I will build and plant it, 10 and if it does evil in my sight, not listening to my voice, then I will relent of the good that I had intended to do to it. 11 Now, therefore, say to the men of Judah and the inhabitants of Jerusalem: ‘Thus says the LORD, Behold, I am shaping disaster against you and devising a plan against you. Return, every one from his evil way, and amend your ways and your deeds.’