Rename variables after import into R

Hello Everyone,

I usually rename my variable name before I import in R. I tried using the below code but can get it to work. What could I be doing wrong?Ethnicity is my original and I want to rename it to RACE. Any help would be appreciated. Thanks jn advance

RD_Exp <- rename(RD_Exp,Race = Ethnicity)

This code works for me.

DF <- data.frame(Ethnicity = c("A", "B", "C"))
library(dplyr, warn.conflicts = TRUE)
DF <- rename(DF, Race = Ethnicity)

Do you get an error running your code? In what way does your code not work?