arduino-cli error downloading platform esp32:[email protected]

[max-arnold]

Trying to upgrade arduino-esp32 from 3.3.0 to 3.3.1 in sketch.yaml:

profiles:
  esp32s3-ospi:
    fqbn: esp32:esp32:esp32s3:CDCOnBoot=cdc,FlashSize=8M,PSRAM=opi,CPUFreq=80,USBMode=hwcdc,FlashMode=qio,PartitionScheme=custom,DebugLevel=none
    platforms:
      - platform: esp32:esp32 (3.3.1)
    libraries: []

...and getting the following error:

Downloading platform esp32:[email protected]...
Downloading index: package_index.tar.bz2 downloaded
Error downloading platform esp32:[email protected]...
Error initializing instance: Error loading hardware platform: loading required platform esp32:[email protected]: Error downloading platform esp32:[email protected]: Platform 'esp32:[email protected]' not found
Error during build: Platform 'esp32:esp32' not found: platform not installed
Platform esp32:esp32 is not found in any known index
Maybe you need to add a 3rd party URL?

Tried both arduino-cli core update-index and arduino-cli lib update-index with no success.