Default Health regen script not working on attributes

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#1

nothing happens (other than hp regen ofc)

-- Gradually regenerates the Humanoid's Health over time.

local REGEN_RATE = 1/100 -- Regenerate this fraction of MaxHealth per second.
local REGEN_STEP = 1 -- Wait this long between each regeneration step.

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local Character = script.Parent
local Humanoid = Character:WaitForChild'Humanoid'

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while task.wait() do
	while Humanoid.Health < Humanoid.MaxHealth do
		local dt = task.wait(REGEN_STEP)
		local dh = dt*REGEN_RATE*Humanoid.MaxHealth
		Humanoid.Health = math.min(Humanoid.Health + dh, Humanoid.MaxHealth)
	end
	while Humanoid:GetAttribute("Mana") < Humanoid:GetAttribute("MaxMana") do
		local dt = task.wait(REGEN_STEP)
		local dh = dt*REGEN_RATE*Humanoid:GetAttribute("MaxMana")
		Humanoid:GetAttribute("Mana", math.min(Humanoid:GetAttribute("Mana") + dh, Humanoid:GetAttribute("MaxMana")))
	end
	while Humanoid:GetAttribute("Stamina") < Humanoid:GetAttribute("MaxStamina") do
		local dt = task.wait(REGEN_STEP)
		local dh = dt*REGEN_RATE*Humanoid:GetAttribute("MaxStamina")
		Humanoid:GetAttribute("Stamina", math.min(Humanoid:GetAttribute("Stamina") + dh, Humanoid:GetAttribute("MaxStamina")))
	end
end