# Updating the model – lazy modification

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### Updating the model - lazy modification

Model modifications in the Gurobi optimizer are done in a lazy fashion, meaning that the effects of the modifications are not seen immediately. This approach makes it easier to perform a sequence of model modifications, since the model doesn't change while it is being modified. However, lazy modifications do require you to manually integrate model changes when needed. This is done with the update method:

  # Integrate new variables
m.update()