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The voting rules of the European Council (EU) under the Treaty of Lisbonbecame effective on 1 November 2014. Kurz \& Napel (2015) showed that thedimension of this voting system is between $7$ and $13,368$. The lower bound$7$ actually sets a new world record for the dimension of the real-world votingbodies. In this article, by finding a new way to represent the union of twoweighted games as an intersection of certain weighted games (Theorem 1), wegreatly reduce the upper bound $13,368$ to just $25$. We also consider whatwill happen to our upper bound and Kurz \& Napel's lower bound if the UnitedKingdom is no longer a member of the European Union Council.

An upper bound on the dimension of the voting system of the European Union Council under the Lisbon rules