To Update a Block Definition After the Inserted Drawing Is Updated

If DesignCenter is not already open, click Insert tab Content panel DesignCenter. Find
In the tree view, click the folder that contains the drawing file that was inserted as a block in the current drawing.
In the content area (on the right side of DesignCenter), right-click the drawing file image and choose Insert as Block.
In the Insert dialog box, click OK.
In the Block - Redefine Block dialog box, click Redefine Block.
Press ESC to exit the command.