Using a novel database of 159 million online job postings, we examine changes in employer skill requirements for education and specific skillsets between 2007 and 2017. We find that upskilling-in terms of increasing demands for bachelor's degrees as well as software skillswas a persistent trend among high-skill occupations, but either a temporary or non-existent phenomenon among middle-skill and low-skill occupations. We also find evidence that persistent upskilling in the high-skill sector contributed to greater occupational mismatch that remained elevated during the recovery from the Great Recession. In contrast, labor market mismatch had largely dissipated within the low-skill and middle-skill sectors by 2017.

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