An upgrade kit for an original roll-bar (RBO) of a historic single-seater car (MPS), comprising an additional roll-bar (RBA) with the shape of an inverted U or V and identifying second two ends (11, 12) operatively lower, and wherein each of said second two ends is adapted to be associated with first two ends of said original roll-bar by means of reversible connection means (21, 22, 31, 32) and at least one additional bracing rod (RA1, RA2) adapted to be connected between a vertex (VA) of said additional roll-bar and said frame or an engine block (H) of said historic single-seater car; the additional roll-bar being operatively superimposed to said original roll-bar.
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