deploy flexdashboard running keras throws reticulate error

i'm trying to deploy an app that runs a keras model with rsconnect::deployApp().

I'm getting this error: * reticulate is in use, but python was not specified

This seems to be a known issue (see https://github.com/rstudio/rsconnect/issues/330) but installing an older version of rsconnect as suggested didn't work for me. Any idea what i could do?