Installed the update and clicked on " > " button next to the site. It popped up " (HTTP code 500) server error - Unknown runtime specified default" and went into perpetual state of 'Starting…". I checked the logs and here the entry -
May 31, 2017, 7:22 AM GMT+5:30 - error: [main/startSite] Error: (HTTP code 500) server error - Unknown runtime specified default
at /Applications/Local by Flywheel.app/Contents/Resources/app.asar/node_modules/docker-modem/lib/modem.js:239:17
at getCause (/Applications/Local by Flywheel.app/Contents/Resources/app.asar/node_modules/docker-modem/lib/modem.js:269:7)
at Modem.buildPayload (/Applications/Local by Flywheel.app/Contents/Resources/app.asar/node_modules/docker-modem/lib/modem.js:238:5)
at IncomingMessage. (/Applications/Local by Flywheel.app/Contents/Resources/app.asar/node_modules/docker-modem/lib/modem.js:214:14)
at emitNone (events.js:91:20)
at IncomingMessage.emit (events.js:185:7)
at endReadableNT (_stream_readable.js:974:12)
at _combinedTickCallback (internal/process/next_tick.js:74:11)
at process._tickDomainCallback (internal/process/next_tick.js:122:9)
Would appreciate if you could provide a quick fix.