diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
index c8a4f7d..c942ee5 100644
--- a/.github/workflows/android.yml
+++ b/.github/workflows/android.yml
@@ -14,6 +14,10 @@ jobs:
     permissions:
       contents: write
     steps:
+    - name: Extract tag name
+      if: startsWith(github.ref, 'refs/tags/')
+      run: echo "RELEASE_VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+
     - name: Set up environment variables
       run: |
         echo "GPR_USER=${{ github.actor }}" >> $GITHUB_ENV
@@ -22,6 +26,7 @@ jobs:
         echo "KEY_PASSWORD=${{ secrets.KEY_PASSWORD }}" >> $GITHUB_ENV
         echo "KEYSTORE_PASSWORD=${{ secrets.KEYSTORE_PASSWORD }}" >> $GITHUB_ENV
         echo "KEYSTORE_BASE64=${{ secrets.KEYSTORE_BASE64 }}" >> $GITHUB_ENV
+        echo "BUILD_NUMBER=${{ github.run_number }}" >> $GITHUB_ENV
 
     - uses: actions/checkout@v4
     - name: set up JDK 17
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 0a190c5..183aaa8 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -15,8 +15,8 @@ android {
         applicationId = "de.timklge.karoopowerbar"
         minSdk = 26
         targetSdk = 33
-        versionCode = 13
-        versionName = "1.3.4"
+        versionCode = 100 + (System.getenv("BUILD_NUMBER")?.toInt() ?: 1)
+        versionName = System.getenv("RELEASE_VERSION") ?: "1.0"
     }
 
     signingConfigs {
@@ -51,9 +51,39 @@ android {
     }
     buildFeatures {
         compose = true
+        buildConfig = true
     }
 }
 
+tasks.register("generateManifest") {
+    description = "Generates manifest.json with current version information"
+    group = "build"
+
+    doLast {
+        val manifestFile = file("$projectDir/manifest.json")
+        val manifest = mapOf(
+            "label" to "karoo-powerbar",
+            "packageName" to "de.timklge.karoopowerbar",
+            "iconUrl" to "https://github.com/timklge/karoo-powerbar/releases/latest/download/karoo-powerbar.png",
+            "latestApkUrl" to "https://github.com/timklge/karoo-powerbar/releases/latest/download/app-release.apk",
+            "latestVersion" to android.defaultConfig.versionName,
+            "latestVersionCode" to android.defaultConfig.versionCode,
+            "developer" to "timklge",
+            "description" to "Adds a colored power or heart rate progress bar to the bottom of the screen, similar to the LEDs on Wahoo computers",
+            "releaseNotes" to "Add touchable back button"
+        )
+
+        val gson = groovy.json.JsonBuilder(manifest).toPrettyString()
+        manifestFile.writeText(gson)
+        println("Generated manifest.json with version ${android.defaultConfig.versionName} (${android.defaultConfig.versionCode})")
+    }
+}
+
+tasks.named("assemble") {
+    dependsOn("generateManifest")
+}
+
+
 dependencies {
     implementation(libs.hammerhead.karoo.ext)
     implementation(libs.androidx.core.ktx)
diff --git a/app/manifest.json b/app/manifest.json
deleted file mode 100644
index 1e9a13b..0000000
--- a/app/manifest.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "label": "karoo-powerbar",
-  "packageName": "de.timklge.karoopowerbar",
-  "iconUrl": "https://github.com/timklge/karoo-powerbar/releases/latest/download/karoo-powerbar.png",
-  "latestApkUrl": "https://github.com/timklge/karoo-powerbar/releases/latest/download/app-release.apk",
-  "latestVersion": "1.3.4",
-  "latestVersionCode": 13,
-  "developer": "timklge",
-  "description": "Adds a colored power bar to the bottom of the screen",
-  "releaseNotes": "Adds option to set a custom range for power and heart rate bar. Optimize build."
-}
\ No newline at end of file
diff --git a/app/src/main/kotlin/de/timklge/karoopowerbar/KarooPowerbarExtension.kt b/app/src/main/kotlin/de/timklge/karoopowerbar/KarooPowerbarExtension.kt
index 5791376..a637fc1 100644
--- a/app/src/main/kotlin/de/timklge/karoopowerbar/KarooPowerbarExtension.kt
+++ b/app/src/main/kotlin/de/timklge/karoopowerbar/KarooPowerbarExtension.kt
@@ -10,7 +10,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
 
-class KarooPowerbarExtension : KarooExtension("karoo-powerbar", "1.3.4") {
+class KarooPowerbarExtension : KarooExtension("karoo-powerbar", BuildConfig.VERSION_NAME) {
 
     companion object {
         const val TAG = "karoo-powerbar"