Y-axis values are not displaying properly

[venkat-tringapps]

my Y-axis values are 6 digit numbers but graph is displaying max 4 digits.
Also Values are overriding in Y-axis.

Is there any way to fix this ?
I am using
rails 6.1.6
ruby 2.6.7
prawn-graph 1.0.6

[venkat-tringapps]

Any Update on my issue?