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In page 1975 Australian constitutional crisis:

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The dismissal is considered the greatest political and constitutional crisis in Australia's history.[1] In 1977, the Fraser government proposed four constitutional amendments via referendum, three of which passed—the last time that the Australian Constitution has been amended. One of the amendments requires that a senator appointed to fill a casual vacancy be from the same party as the former senator.[2] As of 2002, the Senate retains the power to block supply; the governor-general retains the power to dismiss a prime minister.[2] However, these powers have not since been used to force a government from office.[citation needed]