I’m trying to get a real random number in METAPOST

MWE:

\startMPpage[instance=doublefun]
show uniformdeviate 60;
\stopMPpage

Every time I run this, it shows the same result. I tried playing around with 
the randomseed, but for instance when I do two runs shortly after each other 
they still are very predictable. E.g. this in METAPOST:

  whatever = lua( "math.randomseed( 
tonumber(tostring(os.time()):reverse():sub(1,6)) )");
  randomseed := lua.math.random();
  minutespast := uniformdeviate 60;

Called shortly after each other (two LMTX runs) gets me the same result.

What is a good way to get better random numbers in METAPOST (LMTX)?

Thanks,

G
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