Lay recall on Lay's Classic Potato Chips across Oregon and Washington was updated to a Class 1 recall by the FDA on Thursday.

The FDA upgraded a recall for Lay's Classic Potato Chips to the highest risk level for packages distributed in Oregon and Washington.

Class I, according to the FDA, means exposure to or consumption of the product could cause "serious adverse health consequences or death."

The FDA has raised the risk level on a recall of Lay’s potato chips to the highest level, warning the recalled product could cause death. The chips were originally recalled last month for containing undeclared milk.

For many, Lay’s potato chips are a go-to snack. Recently, a serious recall has raised concerns for consumers, especially those with food allergies.

The Food and Drug Administration has newly classified the December recall of some Lay’s Classic Potato Chips sold in Oregon and Washington with the designation reserved for the highest degree of health hazard.

The FDA has upgraded a recall of Lay’s Potato Chips to the highest level possible, meaning consuming the chips will cause adverse health consequences. In December, Texas-based food manufacturer Frito Lay recalled a limited number of Lay’s Classic 13oz because the product could contain undeclared milk ingredients.

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The FDA classified the recall of Lay's Classic Potato Chips in Oregon and Washington state as a Class 1 recall, which means consumption could be fatal for people with a milk allergy.

Federal health authorities have upgraded their recall of 13-ounce bags of Frito-Lay potato chips over fears that consuming the products, which may contain undeclared milk, could potentially be fatal. Last month, the Food and Drug Administration announced that Frito-Lay was voluntarily recalling a limited batch of products.

Lay’s voluntary recall from December has been increased to the U.S. Food and Drug Administration’s highest risk level classification. On Dec. 13, Frito-Lay recalled more than 6,000 bags of 13 oz. Lay’s Classic Potato Chips due to “undeclared milk.” The affected chips were sold in Oregon and Washington.

A party bag of potato chips from Lay's was recalled in December, and has just been given the highest recall classification from the FDA.