Android dependencies failing randomly today

Our Android builds are failing since yesterday on random dependencies that are valid. Re-running from failed sometimes works, but it’s flaky. Repeat builds fail on different dependencies. Here’s an example:

   > Could not resolve com.rollbar:rollbar-android:1.8.1.
     Required by:
         project :app
      > Could not resolve com.rollbar:rollbar-android:1.8.1.
         > Could not get resource 'https://mvnrepository.com/artifact/com.github.gundy/semver4j/com/rollbar/rollbar-android/1.8.1/rollbar-android-1.8.1.pom'.
            > Could not GET 'https://mvnrepository.com/artifact/com.github.gundy/semver4j/com/rollbar/rollbar-android/1.8.1/rollbar-android-1.8.1.pom'. Received status code 403 from server: Forbidden
      > Could not resolve com.rollbar:rollbar-android:1.8.1.
         > Could not get resource 'https://jitpack.io/com/rollbar/rollbar-android/1.8.1/rollbar-android-1.8.1.pom'.
            > Could not GET 'https://jitpack.io/com/rollbar/rollbar-android/1.8.1/rollbar-android-1.8.1.pom'. Received status code 521 from server:

Builds seem to be working again today