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Not to be confused with promoting units
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Older units in most games of the Civilization series may upgrade to newer unit types, gaining increased combat strength and possibly other abilities.

Civilization II

The main article has not been created for (or Upgrade is not part of) Civilization II

While units in Civilization II cannot upgrade like they are able to in later games, Leonardo's Workshop provides its owner upgrades until the discovery of the Automobile.

Civilization III

The main article has not been created for (or Upgrade is not part of) Civilization III

Units can be upgraded in cities with a Barracks in Civilization III. Leonardo's Workshop halves the cost of upgrading units in this game.

Civilization IV

Civilization V

Civilization VI

Civilization: Beyond Earth

Civilization Revolution

The main article has not been created for (or Upgrade is not part of) Civilization Revolution

Leonardo's Workshop upgrades current units into their most powerful form, but not future units.

Sid Meier's Colonization

The main article has not been created for (or Upgrade is not part of) Sid Meier's Colonization

A limited number of veteran units can be upgraded to Continental Soldiers in Sid Meier's Colonization when players declare Independence.

FreeCol

The main article has not been created for (or Upgrade is not part of) FreeCol

A limited number of veteran units can be upgraded to Continental Soldiers in FreeCol when players declare Independence.

Civilization IV: Colonization

The main article has not been created for (or Upgrade is not part of) Civilization IV: Colonization

A limited number of veteran units can be upgraded to Continental Soldiers in Civilization IV: Colonization when players declare Independence.

Starships

The main article has not been created for (or Upgrade is not part of) Starships

Players upgrade individual Starship parts in Sid Meier's Starships.

Other games

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

Game Article
Civilization Upgrade (Civ1)
Civilization VII Upgrade (Civ7)
Civilization Revolution 2 Upgrade (CivRev2)
CivWorld Upgrade (CivWorld)
Freeciv Upgrade (Freeciv)
Civilization: Call to Power Upgrade (CTP1)
Call to Power II Upgrade (CTP2)
C-evo Upgrade (C-evo)
Sid Meier's Alpha Centauri‎ Upgrade (SMAC)

Future technology (CivRev)
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