Assume a capacitor's voltage limit be v, and the target voltage limit be V.
What is the way of connecting the capacitors to reach the V?
Answer
Connecting two identical capacitors in series, each with voltage threshold v and capacitance c, will result into a combined capacitance of 1/2 c and voltage threshold of 2 v.
However, it is far better to get a single capacitor that meets the higher voltage threshold on its own as combining capacitors in series will also lead to a higher Effective Series Resistance (ESR). In the scenario above, you will double the ESR. High ESR can cause unwanted or catastrophic effects on circuits not designed to handle it.
See more here: What are some reasons to connect capacitors in series? and here Can you make a non-polar electrolytic capacitor out of two regular electrolytic capacitors?
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