Italics in ggplot

I'm having trouble italicizing my title. I've tried a couple different codes, but none seem to register with R. Does anyone have a suggestion based on my code? Thanks in advance.

ggplot(aes(x = year, y = Ratio, group = Category, color = Category), data = Cat_Year) +
  #geom_line() +
  stat_smooth(se=F) +
  theme_bw() +
  ggtitle("Ratio of Posts by Category")+
  ylab("Weight of Category") +

You can change the text properties of the plot title with the theme function. See: Theme and Theme elements

Compare these two plots:

  Df <- data.frame(X = 1:4, Y = 1:4)
  ggplot(Df, aes(X, Y)) + geom_point() +
    labs(title = "My Title") 

  ggplot(Df, aes(X, Y)) + geom_point() +
    labs(title = "My Title") +
    theme(plot.title = element_text(face = "italic"))

Created on 2021-02-08 by the reprex package (v0.3.0)

Beautiful. Thank you.

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