Yes, in 2019, the definition of an ampere was changed. This was because the previous definition was hard to acknowledge in practice without a high degree of precision. An amp used to have a complicated definition, being the current maintained between two conductors of infinite length and 1 meter apart in a vacuum that would produce a force of 2 x 10^7 Newtons per meter of length. The new definition is a lot easier to illustrate, being 1 Coulomb’s worth of electric charge moving past a point in 1 second, where a Coulomb is equivalent to 6.24 x 10^18 electrons worth of charge.