Labor Secretary Hilda Solis stepped down from her post on Wednesday, further reshuffling President Obama’s Cabinet as it undergoes a major makeover heading into his second term.

Solis announced her resignation in a letter to colleagues on Wednesday. Obama, who has come under fire for a lack of new female appointments to senior posts, praised Solis for her four years of service.

“Hilda Solis has been a tireless champion for working families,” Obama said in a statement. “Over the last four years, Secretary Solis has been a critical member of my economic team as we have worked to recover from the worst economic downturn since the Great Depression and strengthen the economy for the middle class.”

As news of Solis’ departure broke, a White House official also said that Secretary of Health and Human Services Kathleen Sebelius, Secretary of Veterans Affairs Eric Shinseki and Attorney General Eric Holder would remain in their current positions after Inauguration Day.

However, Holder previously said he would likely leave after the first year of Obama’s second term. It’s unclear how long the trio has committed to staying.