Unable to read or update hashMap values

I am trying to retrieve values from hashMAp and update them after adding to an integer here is my code:
for players in 1..=num{
println!("Enter the name of player # {}",players);
.read_line(&mut player_name)
.expect("Failed to read line");
for (key, value) in scores.iter() {
let secret_number = rand::thread_rng().gen_range(1, 6);
let sc = value + secret_number;
println!("Turn {} Dice Roll of Player {} - {} is {} and Total {:?}",turn,count,key,
CurrentRoll = secret_number;

    count += 1;
count = 1;

I am getting this error

 for (key, value) in scores.iter() {

| -------------
| |
| immutable borrow occurs here
| immutable borrow later used here
54 | scores.insert(key.to_string(),sc);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ mutable borrow occurs here

I am not able to undersand

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