Older units in most games of the Civilization series may upgrade to newer unit types, gaining increased combat strength and possibly other abilities.

Civilization IV

Main article: Upgrade (Civ4)

Other games

Upgrade is not present in (or the article has not been created for) the following games :

Game Article
Civilization Upgrade (Civ1)
Civilization II Upgrade (Civ2)
Civilization III Upgrade (Civ3)
Civilization V Upgrade (Civ5)
Civilization VI Upgrade (Civ6)
Civilization: Beyond Earth Upgrade (CivBE)
Civilization Revolution Upgrade (CivRev)
Civilization Revolution 2 Upgrade (CivRev2)
Freeciv Upgrade (Freeciv)
Civilization: Call to Power Upgrade (CTP1)
Call to Power II Upgrade (CTP2)
C-evo Upgrade (C-evo)
Colonization Upgrade (Col)
FreeCol Upgrade (FreeCol)
Civilization IV: Colonization Upgrade (Civ4Col)
Sid Meier's Alpha Centauri‎ Upgrade (SMAC)

Future Technology (CivRev)
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