diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/core/manager/BuildManager.kt b/app/src/main/java/pl/szczodrzynski/edziennik/core/manager/BuildManager.kt
index 80e1801c..4844bc0d 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/core/manager/BuildManager.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/core/manager/BuildManager.kt
@@ -103,7 +103,7 @@ class BuildManager(val app: App) : CoroutineScope {
         else -> Update.Type.RELEASE
     }
 
-    val devModeEasy = (isDaily || isNightly || isDebug) && !App.devMode
+    val devModeEasy = (releaseType == Update.Type.NIGHTLY || isDebug) && !App.devMode
 
     fun fetchInstalledTime() {
         if (app.config.appInstalledTime != 0L)
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/core/manager/UpdateManager.kt b/app/src/main/java/pl/szczodrzynski/edziennik/core/manager/UpdateManager.kt
index 67c75295..c319402d 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/core/manager/UpdateManager.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/core/manager/UpdateManager.kt
@@ -30,6 +30,31 @@ class UpdateManager(val app: App) : CoroutineScope {
     override val coroutineContext: CoroutineContext
         get() = job + Dispatchers.Default
 
+    fun isApplicable(update: Update): Boolean {
+        if (app.buildManager.isDebug)
+            return false // no updates on debug
+        if (update.versionCode > BuildConfig.VERSION_CODE)
+            return true
+        if (update.versionCode < BuildConfig.VERSION_CODE)
+            return false
+        if (update.versionName == BuildConfig.VERSION_NAME)
+            return false
+        if (app.buildManager.isNightly || app.buildManager.isDaily) {
+            val updateDate =
+                update.versionName
+                    .replace("""\D""".toRegex(), "")
+                    .padEnd(12, '9')
+                    .toIntOrNull() ?: return false
+            val buildDate =
+                BuildConfig.VERSION_NAME
+                    .replace("""\D""".toRegex(), "")
+                    .padEnd(12, '9')
+                    .toIntOrNull() ?: return false
+            return updateDate > buildDate
+        }
+        return false
+    }
+
     /**
      * Check for updates on the specified [maxChannel].
      * If the running build is of "more-unstable" type,
@@ -75,7 +100,7 @@ class UpdateManager(val app: App) : CoroutineScope {
      * @return [update] if it's a newer version, null otherwise
      */
     fun process(update: Update?, notify: Boolean): Update? {
-        if (update == null || update.versionCode <= BuildConfig.VERSION_CODE) {
+        if (update == null || !isApplicable(update)) {
             app.config.update = null
             return null
         }
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/core/work/UpdateWorker.kt b/app/src/main/java/pl/szczodrzynski/edziennik/core/work/UpdateWorker.kt
index 11d586e5..0ca73895 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/core/work/UpdateWorker.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/core/work/UpdateWorker.kt
@@ -11,6 +11,7 @@ import kotlinx.coroutines.*
 import pl.szczodrzynski.edziennik.*
 import pl.szczodrzynski.edziennik.data.api.szkolny.response.Update
 import pl.szczodrzynski.edziennik.ext.DAY
+import pl.szczodrzynski.edziennik.ext.HOUR
 import pl.szczodrzynski.edziennik.ext.formatDate
 import pl.szczodrzynski.edziennik.utils.Utils
 import timber.log.Timber
@@ -41,7 +42,11 @@ class UpdateWorker(val context: Context, val params: WorkerParameters) : Worker(
             if (!app.config.sync.notifyAboutUpdates) {
                 return
             }
-            val syncInterval = 4 * DAY;
+            val syncInterval =
+                if (app.buildManager.releaseType == Update.Type.NIGHTLY)
+                    12 * HOUR
+                else
+                    4 * DAY
 
             val syncAt = System.currentTimeMillis() + syncInterval*1000
             Timber.d("Scheduling work at ${syncAt.formatDate()}")
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/SignatureInterceptor.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/SignatureInterceptor.kt
index 275a1909..060f29fc 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/SignatureInterceptor.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/SignatureInterceptor.kt
@@ -29,9 +29,10 @@ class SignatureInterceptor(val app: App) : Interceptor {
         return chain.proceed(
                 request.newBuilder()
                         .header("X-ApiKey", app.config.apiKeyCustom?.takeValue() ?: API_KEY)
-                        .header("X-AppBuild", BuildConfig.BUILD_TYPE)
-                        .header("X-AppFlavor", BuildConfig.FLAVOR)
+                        .header("X-AppBuild", app.buildManager.buildType)
+                        .header("X-AppFlavor", app.buildManager.buildFlavor)
                         .header("X-AppVersion", BuildConfig.VERSION_CODE.toString())
+                        .header("X-AppReleaseType", app.buildManager.releaseType.name.lowercase())
                         .header("X-DeviceId", app.deviceId)
                         .header("X-Signature", sign(timestamp, body, url))
                         .header("X-Timestamp", timestamp.toString())
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/dialogs/sync/UpdateAvailableDialog.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/dialogs/sync/UpdateAvailableDialog.kt
index 3b14f0b5..46c9e4a6 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/dialogs/sync/UpdateAvailableDialog.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/dialogs/sync/UpdateAvailableDialog.kt
@@ -46,6 +46,6 @@ class UpdateAvailableDialog(
 
     override suspend fun onBeforeShow(): Boolean {
         // show only if app is older than available
-        return update == null || update.versionCode > BuildConfig.VERSION_CODE
+        return update == null || app.updateManager.isApplicable(update)
     }
 }
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/dialogs/sync/UpdateProgressDialog.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/dialogs/sync/UpdateProgressDialog.kt
index c1fc158e..33d7dcec 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/dialogs/sync/UpdateProgressDialog.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/dialogs/sync/UpdateProgressDialog.kt
@@ -35,7 +35,6 @@ class UpdateProgressDialog(
     override fun getNegativeButtonText() = R.string.cancel
 
     override suspend fun onShow() {
-        EventBus.getDefault().register(this)
         b.update = update
         b.progress.progress = 0
 
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/home/HomeFragment.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/home/HomeFragment.kt
index 4254cb01..1c3d6d04 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/home/HomeFragment.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/home/HomeFragment.kt
@@ -164,7 +164,7 @@ class HomeFragment : BaseFragment<FragmentHomeBinding, MainActivity>(
 
         val status = app.availabilityManager.check(app.profile, cacheOnly = true)?.status
         val update = app.config.update
-        if (update != null && update.versionCode > BuildConfig.VERSION_CODE || status?.userMessage != null) {
+        if (update != null && app.updateManager.isApplicable(update) || status?.userMessage != null) {
             items.add(0, HomeAvailabilityCard(102, app, activity, this, app.profile))
         }
 
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/home/cards/HomeAvailabilityCard.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/home/cards/HomeAvailabilityCard.kt
index 4bb264d0..8b042f77 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/home/cards/HomeAvailabilityCard.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/home/cards/HomeAvailabilityCard.kt
@@ -80,7 +80,7 @@ class HomeAvailabilityCard(
             }
         }
         // show "update available" when available OR version too old for the register
-        else if (update != null && update.versionCode > BuildConfig.VERSION_CODE) {
+        else if (update != null && app.updateManager.isApplicable(update)) {
             b.homeAvailabilityTitle.setText(R.string.home_availability_title)
             b.homeAvailabilityText.setText(R.string.home_availability_text, update.versionName)
             b.homeAvailabilityUpdate.isVisible = !app.buildManager.isPlayRelease
@@ -94,9 +94,7 @@ class HomeAvailabilityCard(
         }
 
         b.homeAvailabilityUpdate.onClick {
-            if (update == null)
-                return@onClick
-            if (update.isOnGooglePlay)
+            if (update == null || update.isOnGooglePlay)
                 Utils.openGooglePlay(activity)
             else
                 activity.startService(Intent(app, UpdateDownloaderService::class.java))