Sparkle shows popup "App up to Date" every time on launch if app is in latest version

Question

I'm using Sparkle with Go App.

sparkle.m :

#import <Headers/SUUpdater.h>

static SUUpdater* updater = nil;

void sparkle_checkUpdates()
{
    if (!updater) {
        updater = [[SUUpdater sharedUpdater] retain];
    }

    [updater setUpdateCheckInterval:3600];
    [updater checkForUpdates:updater];
}

main.go :

func main() {
    sparkle.Sparkle_checkUpdates()
    // Some blocking call
}

I uploaded an appcast.xml file and Sparkle is working fine, the update is detected properly.

But after updating, on every startup of the app, an 'up to date' popup shows up :

I want this message to not show up. Popup should be shown only if an update is available.

For this I tried replacing

[updater checkForUpdates:updater];

with

[updater checkForUpdatesInBackground];

but now Sparkle doesn't work even if there's an update. No Popup shows up.

What am I missing here ?

Thanks for any help!