Halloween at The University of Colorado at Boulder may look a little different this year.
The dean of students recently sent out a letter asking students not to dress as anything offensive this Halloween.
Along with the letter, the dean released a list of all costumes deemed to be offensive or culturally insensitive.
The list bans cultural stereotypes such as sombreros, geishas, Native Americans, and cowboys.
Some students plan to protest the list. They feel the it goes too far and is oversensitive.
Some other banned costumes include cops, robbers and mafia members.
The letter ends telling students their freedom of expression and creativity are encouraged, but the CU community values inclusiveness, respect and sensitivity.