Navantia Cádiz, Spain; scheduled maintenance and classification work, new red, white, and blue hull livery, accessibility modifications to 45 cabins, and installation of Carnival's first dedicated pickleball court.

Carnival Conquest underwent a two-week refurbishment at Grand Bahama Shipyard in Freeport, The Bahamas, highlighted by the addition of the Serenity Adult-Only Retreat on the forward upper decks. The new relaxation area, spanning Decks 12 and 14, introduced cushioned loungers, hammocks, shaded clamshell seating, whirlpool tubs and a dedicated bar for guests aged 21 and older. The refurbishment also included technical maintenance and cosmetic improvements to existing passenger areas. The EA SPORTS Bar was rebranded as SKYBOX Sports Bar, and the Lido Deck pizzeria was updated to the Pizza Pirate concept. The work followed the ship's more extensive Fun Ship 2.0 refurbishment in 2012, concentrating primarily on the new adults-only retreat, maintenance and selected venue improvements rather than a comprehensive redesign of the ship.

Freeport, The Bahamas; multi-million-dollar Fun Ship 2.0 refurbishment added Guy's Burger Joint, BlueIguana Cantina, RedFrog Rum Bar, BlueIguana Tequila Bar, Alchemy Bar, and EA SPORTS Bar.

Carnival Conquest underwent a multimillion-dollar refurbishment during the final two weeks of January 2009, introducing new passenger amenities and improvements throughout the ship. Eighteen existing ocean-view staterooms on Spa Deck were converted into balcony accommodations. A new Circle C club was introduced for passengers aged 12–14, featuring plasma televisions, video games, movies, a touchscreen jukebox and interactive entertainment facilities. The 4,200-square-foot Camp Carnival children's area was remodeled with updated gaming stations, while the 1,800-square-foot Club O2 teen lounge received new plasma televisions and other improvements. A 270-square-foot LED Seaside Theatre screen was installed overlooking the main Lido Deck swimming pool, providing outdoor movies, concerts, sporting events and other programming through a 70,000-watt sound system. Additional upgrades included new exercise equipment in the 14,500-square-foot Spa Carnival fitness facility and the introduction of shipwide Wi-Fi connectivity. The ship resumed its regular seven-night Caribbean cruise schedule from Galveston in early February 2009.