Effectively replace a key in a dictionary

Hello, please tell me a way to effectively replace a key in a dictionary, or a package that implements a data structure that allows you to do this, due to a fixed number of key-value pairs

i have too many allocations, it is bad

using BenchmarkTools

n = 10^6;
d = Dict([i => i for i = 1 : n]...);
keys = [rand(1:n) for i in 1:2*n];

replace_keys(d, n) = for k in keys
    if !haskey(d, k)
        d[k] = k

@btime replace_keys(d, keys);  # -> 320.215 ms (5998457 allocations: 122.05 MiB) !!!

sorry, bug

can i delete this topic?