Academy Award winner Lupita Nyong'o says she's "disappointed" by "the lack on inclusion" in this year's Oscar nominations.

In a statement posted late Tuesday night on Instagram, Nyong'o said she was joining in "calling for change in expanding the stories that are told and recognition of the people who tell them." Following a second straight year of all-white acting nominees, lifetime achievement honoree Spike Lee has said he won't attend the Feb. 28 ceremony, and the Rev. Al Sharpton has called for a boycott of the awards.

Nyong'o said the Oscars should be "a diverse reflection of the best of what our art has to offer today."

The 32-year-old, Kenya-raised actress won best supporting actress for her performance in "12 Years a Slave" in 2014.