[Python] Why is my instance variable not updating inside a Python class?

I am learning OOP in Python. I created a class and tried to update an instance variable inside a method, but the value doesn’t change.

class Student:
def __init__(self, name, marks):
self.name = name
self.marks = marks

def update_marks(self, value):
marks = value # not updating self.marks ?

s = Student("Shivam", 80)
s.update_marks(95)
print(s.marks) # still prints 80

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