It was the second update to the Fire since the tablet was introduced five weeks ago, Computerworld reported Wednesday.
The updated version 6.2.1 of the Fire's system software will be delivered automatically to all Fire tablets via WiFi, Amazon said.
Users can initiate the update process by tapping the Quick Settings icon at the upper right of the tablet's display and then touching "Sync," the company said.
The 6.2.1 update "enhances fluidity and performance [and] improves touch navigation responsiveness," Amazon said on its Web site Wednesday.
Users will also now be able to password-lock the WiFi connection, a change parents had been clamoring for to prevent children from seeing all content on the tablet.
Some users say they still have complaints about the hardware, citing the absence of external volume controls and the location of the tablet's power switch, said by some to be too easy to inadvertently trigger.