Deployment Error

I'm trying to troubleshoot an error when updating a shiny app. Is this just a compatibility issue with the version of R I have installed? Not exactly sure what the relevant bit of code is, so please let me know if additional information would be helpful.

----- Deployment error -----
Error: Unhandled Exception: Child Task 594759138 failed: Error building image: R version 3.5.3 currently unavailable
 
----- Error stack trace -----
3: stop(status$error, call. = FALSE)
2: client$waitForTask(taskId, quiet)
1: rsconnect::deployApp(appDir = "~/Shiny Apps/xxx", appFileManifest = "C:/Users/xxx/AppData/Local/Temp/c1f5-a829-eb62-589a", 
       account = "xxx", server = "shinyapps.io", 
       appName = "xxx", appTitle = "xxx", launch.browser = function(url) {
           message("Deployment completed: ", url)
       }, lint = FALSE, metadata = list(asMultiple = FALSE, asStatic = FALSE), 
       logLevel = "verbose")
Error: Unhandled Exception: Child Task 594759138 failed: Error building image: R version 3.5.3 currently unavailable
Execution halted

It takes a bit of time between a new release of R and when it is supported on shinyapps.io.
Unfortunately we had a hiccup in our automated process and it is taking a bit longer than usual. We should have it available by tomorrow. In the meantime you can use versions up to and including 3.5.2

Thank you for the quick resolution!

R 3.5.3 should now be available.