Tech Jan 20, 2026 4 min jQuery 4.0 is out: a catch-up guide for people who stopped at 1.x jQuery 4.0 was released on January 17, 2026. This is a catch-up for people who drifted away after the painful 1.x to 2.x transition, covering what changed in 3.x and what changed again in 4.0. jQuery JavaScript
