Moderna (MRNA) announced that it is "advancing an emerging variant booster candidate against the variant first identified in the Republic of South Africa" to see if it's more effective against that strain than its currently-approved vaccine.
But, it does believe that its current vaccine is expected to be protective against the emerging strain from the United Kingdom
“As we seek to defeat the COVID-19 virus, which has created a worldwide pandemic, we believe it is imperative to be proactive as the virus evolves. We are encouraged by these new data, which reinforce our confidence that the Moderna COVID-19 Vaccine should be protective against these newly detected variants,” said CEO Stéphane Bancel. “Out of an abundance of caution and leveraging the flexibility of our mRNA platform, we are advancing an emerging variant booster candidate against the variant first identified in the Republic of South Africa into the clinic to determine if it will be more effective to boost titers against this and potentially future variants.”