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Try to explain for them what is in it for them Change is always hard and in order to adopt change, implementers should feel it comes with direct benefits to them.
Assign them task where they are forced to change their attitude with a sense that they are all necessary for the Organisation.Place them in an environment full of multicultural people and make them in-charge of dealing with them with a caveat that they must steer the group in a way they turn productive for the Organisation, so to say make them the Leader of this multicultural group. Post that you can expect a massive change in their rigid mindset.
They certainly have very good reason for being hard (at least they believe). get the reason, get the motivation set a adapted management
Put yourself in their place is the first step