diff --git a/app/build.gradle b/app/build.gradle
index ba61248..ba50230 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -6,12 +6,12 @@ plugins {
 }
 
 android {
-    compileSdk 33
+    compileSdk 34
 
     defaultConfig {
         applicationId "cz.skaut.srs.ticketsreader"
         minSdk 26
-        targetSdk 33
+        targetSdk 34
         versionCode 4
         versionName "1.1"
 
@@ -42,22 +42,22 @@ android {
 }
 
 dependencies {
-    implementation 'androidx.core:core-ktx:1.10.1'
+    implementation 'androidx.core:core-ktx:1.12.0'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'com.google.android.material:material:1.9.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
-    implementation "androidx.preference:preference-ktx:1.2.0"
+    implementation "androidx.preference:preference-ktx:1.2.1"
     implementation 'org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.0'
     implementation 'org.jetbrains.kotlinx:kotlinx-datetime:0.4.1'
 
     // Barcode scanning API
-    implementation 'com.google.mlkit:barcode-scanning:17.1.0'
+    implementation 'com.google.mlkit:barcode-scanning:17.2.0'
 
     // CameraX library
-    def camerax_version = "1.2.3"
+    def camerax_version = "1.3.0-rc02"
     implementation "androidx.camera:camera-camera2:$camerax_version"
     implementation "androidx.camera:camera-lifecycle:$camerax_version"
-    implementation "androidx.camera:camera-view:1.3.0-beta01"
+    implementation "androidx.camera:camera-view:$camerax_version"
 
     def ktor_version = "2.3.4"
     implementation "io.ktor:ktor-client-core:$ktor_version"
diff --git a/app/src/main/java/cz/skaut/srs/ticketsreader/scanner/QrBoxView.kt b/app/src/main/java/cz/skaut/srs/ticketsreader/scanner/QrBoxView.kt
index ec88f56..fe8466a 100644
--- a/app/src/main/java/cz/skaut/srs/ticketsreader/scanner/QrBoxView.kt
+++ b/app/src/main/java/cz/skaut/srs/ticketsreader/scanner/QrBoxView.kt
@@ -17,14 +17,14 @@ class QrBoxView(context: Context) : View(context) {
     private val paint = Paint()
     private var rectangle = Rect()
 
-    override fun onDraw(canvas: Canvas?) {
+    override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
 
         paint.style = Paint.Style.STROKE
         paint.color = Color.RED
         paint.strokeWidth = STROKE_WIDTH
 
-        canvas?.drawRoundRect(rectangle.toRectF(), CORNER_RADIUS, CORNER_RADIUS, paint)
+        canvas.drawRoundRect(rectangle.toRectF(), CORNER_RADIUS, CORNER_RADIUS, paint)
     }
 
     fun setRect(rect: Rect) {