Scala Map update

I want to update Map value which is present in another Map. When I try to update is says 'value update is not a member of Option[scala.collection.immutable.Map[Int,Int]]'.

I tried to convert the value to Map but still, it didn't work for me.

  val map = Map("one" -> Map(1 -> 11), "two" -> Map(2 -> 22))
  val value = map1.get("one")
  value(1) = 100  //value update is not a member of Option[scala.collection.Map[Int,Int]]