A group of former healthcare workers in Maine who sued over the state’s vaccine mandate are filing an appeal to revive the case.

According to the Portland Press Herald, attorneys representing the group are challenging a judge’s decision last month to dismiss their case.

The mandate, which took effect in October, requires all healthcare workers in Maine to receive a COVID-19 vaccine. The group challenged the mandate on religious grounds.

Attorneys will have a month to file their appeal with the 1st Circuit Court of Appeals in Boston.