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myBarChart.options.scales.yAxes[0].ticks.beginAtZero = false;
// You probably also want to move your min :
myBarChart.options.scales.yAxes[0].ticks.min = 100;
// and call update:
// myBarChart.update();
Here’s pen with some buttons if you want to experiment:
Chart.js add/remove adjust data
Another thing you can do, is destroy and rebuild the chart :
Source:stackexchange.com