Shinyapps crushing on htmltools

I'm trying to upload my app to shinyapp but htmltools is constantly crushing.

Uploading bundle for application: 1507896...DONE
Deploying bundle: 2607768 for application: 1507896 ...
Waiting for task: 669503315
building: Parsing manifest
building: Building image: 2838205
building: Installing system dependencies
building: Fetching packages
error: Building package: htmltools

Error: Unhandled Exception: Child Task 669503318 failed: Error building image: Error fetching htmltools ( source. unable to satisfy package: htmltools (
In addition: There were 33 warnings (use warnings() to see them)

Any suggestions?

It seems like you have the development version of htmltools, try updating it or install a stable version from CRAN before deploying your app.

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