diff --git a/app/build.gradle b/app/build.gradle
index 204dae1..89e3f78 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -93,8 +93,8 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
     implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.7.0'
     implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.7.0'
-    implementation 'androidx.navigation:navigation-fragment-ktx:2.7.6'
-    implementation 'androidx.navigation:navigation-ui-ktx:2.7.6'
+    implementation 'androidx.navigation:navigation-fragment-ktx:2.7.7'
+    implementation 'androidx.navigation:navigation-ui-ktx:2.7.7'
     implementation 'com.google.zxing:core:3.4.1'
     implementation 'androidx.room:room-runtime:2.6.1'
     implementation 'androidx.coordinatorlayout:coordinatorlayout:1.2.0'
diff --git a/app/src/other/java/io/nekohasekai/sfa/vendor/Vendor.kt b/app/src/other/java/io/nekohasekai/sfa/vendor/Vendor.kt
index effa5c4..121d1e4 100644
--- a/app/src/other/java/io/nekohasekai/sfa/vendor/Vendor.kt
+++ b/app/src/other/java/io/nekohasekai/sfa/vendor/Vendor.kt
@@ -11,6 +11,9 @@ object Vendor : VendorInterface {
     override fun checkUpdate(activity: Activity, byUser: Boolean) {
     }
 
+    override fun initializeBillingClient(activity: Activity) {
+    }
+
     override fun startSponsor(activity: Activity, fallback: () -> Unit) {
         fallback()
     }