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This phone is more than 2 years old model, I suggest you don't put high hopes on getting more software update to it. Anyways, use this link to send this request to Sony directly:
Hi @spgn_ece
There isn't an official upgrade for the Xperia M device.to Kitkat.
If you want, you can check this link where you will find a custom cangenmod 12.0 ROM to ugrade this device to Lollipop:
http://forum.xda-developers.com/xperia-m/orig-development/rom-unofficial-cyanogenmod-12-t2948220
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I'm at disposal for any question.
Best Regards,