warning message using plot() with model created by stan_surv

[AliG71]

I have been using the stan_surv function of rstanarm (version 2.36.0.9000) for some survival analyses and it is working well. However, when I use the plot() function on the model to display the baseline hazard, I get this warning:

aes_string()was deprecated in ggplot2 3.0.0. ℹ Please use tidy evaluation idioms withaes(). ℹ See also vignette("ggplot2-in-packages")` for more information.
ℹ The deprecated feature was likely used in the rstanarm package.

Is it possible to update this feature, or am I using an out of date version of rstanarm?
Many thanks