In an Jupyter notebook markdown cell I evaluate
<img src="mypic.png">
which displays the pic in the notebook. If I replace the file mypic.png and evaluate the above command again, the displayed image remains the old. The same happens if include the picture using markdown, like

To change the displayed image I have to either restart the kernel or change the filename and include the pic with new filename, like ![mypic(mypic_.png)
.
What's the problem here and how do I solve it?