CANTON (CBS) — Dunkin’ lovers can now get an extra caffeine boost in their coffee. The Canton-based chain is now selling a new blend with 20% more caffeine than a normal cup.

The “Extra Charged Coffee” features green coffee extract. Medium sizes will be on sale for $2 through Jan. 26 for both hot and iced versions.

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Dunkin is also releasing two new blends: A super dark roast called “Dunkin’ Midnight” and “Explorer Batch” – the first of Dunkin’s limited batch series.

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All will be available through the end of January.

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Dunkin’ was sold to Inspire Brands in the fall in a $11.3 billion deal.