Medium Armor Master

General Feat (Prerequisites: Level 4+, Medium Armor Training)

Ability Score Increase. Increase your Strength or Dexterity score by 1, to a maximum of 20.

You gain the following benefits.

Dexterous Wearer.

While you're wearing Medium armor, you can add 3, rather than 2 to your AC if you have a Dexterity score of 16 or higher.

Source: PHB'24, page 205