diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 4735169fd..d347e7404 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -253,7 +253,7 @@ dependencies {
     googleplayImplementation("com.google.firebase:firebase-config-ktx:${Versions.remote_config}")
     googleplayImplementation("com.google.android.gms:play-services-location:19.0.1")
     googleplayImplementation("com.google.android.gms:play-services-maps:18.0.2")
-    googleplayImplementation("com.android.billingclient:billing-ktx:3.0.3")
+    googleplayImplementation("com.android.billingclient:billing-ktx:4.0.0")
     googleplayImplementation("com.google.android.play:core:1.10.3")
     googleplayImplementation("com.google.android.play:core-ktx:1.8.1")
     googleplayImplementation("com.google.android.gms:play-services-oss-licenses:17.0.0")
diff --git a/app/src/googleplay/java/org/tasks/billing/BillingClientImpl.kt b/app/src/googleplay/java/org/tasks/billing/BillingClientImpl.kt
index 4510d82fc..1bcd24b7a 100644
--- a/app/src/googleplay/java/org/tasks/billing/BillingClientImpl.kt
+++ b/app/src/googleplay/java/org/tasks/billing/BillingClientImpl.kt
@@ -2,19 +2,12 @@ package org.tasks.billing
 
 import android.app.Activity
 import android.content.Context
-import com.android.billingclient.api.AcknowledgePurchaseParams
+import com.android.billingclient.api.*
 import com.android.billingclient.api.BillingClient.*
-import com.android.billingclient.api.BillingClientStateListener
-import com.android.billingclient.api.BillingFlowParams
 import com.android.billingclient.api.BillingFlowParams.ProrationMode
-import com.android.billingclient.api.BillingResult
-import com.android.billingclient.api.ConsumeParams
+import com.android.billingclient.api.BillingFlowParams.SubscriptionUpdateParams
 import com.android.billingclient.api.Purchase.PurchaseState
 import com.android.billingclient.api.Purchase.PurchasesResult
-import com.android.billingclient.api.PurchasesUpdatedListener
-import com.android.billingclient.api.SkuDetailsParams
-import com.android.billingclient.api.querySkuDetails
-import com.android.billingclient.api.consumePurchase
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.NonCancellable
@@ -77,7 +70,7 @@ class BillingClientImpl(
         purchases?.forEach {
             firebase.reportIabResult(
                 result.responseCodeString,
-                it.sku,
+                it.skus.joinToString(","),
                 it.purchaseState.purchaseStateString
             )
         }
@@ -112,9 +105,12 @@ class BillingClientImpl(
                     ?: throw IllegalStateException("Sku $sku not found")
             val params = BillingFlowParams.newBuilder().setSkuDetails(skuDetails)
             oldPurchase?.let {
-                params
-                    .setOldSku(it.sku, it.purchaseToken)
-                    .setReplaceSkusProrationMode(ProrationMode.IMMEDIATE_WITH_TIME_PRORATION)
+                params.setSubscriptionUpdateParams(
+                    SubscriptionUpdateParams.newBuilder()
+                        .setOldSkuPurchaseToken(it.purchaseToken)
+                        .setReplaceSkusProrationMode(ProrationMode.IMMEDIATE_WITH_TIME_PRORATION)
+                        .build()
+                )
             }
             if (activity is OnPurchasesUpdated) {
                 onPurchasesUpdated = activity
diff --git a/app/src/googleplay/java/org/tasks/billing/Purchase.kt b/app/src/googleplay/java/org/tasks/billing/Purchase.kt
index d82453eac..7b5995c1c 100644
--- a/app/src/googleplay/java/org/tasks/billing/Purchase.kt
+++ b/app/src/googleplay/java/org/tasks/billing/Purchase.kt
@@ -24,7 +24,7 @@ class Purchase(private val purchase: Purchase) {
         get() = purchase.signature
 
     val sku: String
-        get() = purchase.sku
+        get() = purchase.skus.first()
 
     val purchaseToken: String
         get() = purchase.purchaseToken
diff --git a/deps_googleplay.txt b/deps_googleplay.txt
index bca62e363..13306ca61 100644
--- a/deps_googleplay.txt
+++ b/deps_googleplay.txt
@@ -250,8 +250,8 @@
 +|    +--- androidx.fragment:fragment:1.0.0 -> 1.4.0 (*)
 +|    +--- com.google.android.gms:play-services-base:18.0.1 (*)
 +|    \--- com.google.android.gms:play-services-basement:18.0.0 (*)
-++--- com.android.billingclient:billing-ktx:3.0.3
-+|    +--- com.android.billingclient:billing:3.0.3
+++--- com.android.billingclient:billing-ktx:4.0.0
++|    +--- com.android.billingclient:billing:4.0.0
 +|    +--- org.jetbrains.kotlin:kotlin-stdlib:1.4.0 -> 1.7.20 (*)
 +|    \--- org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.9 -> 1.6.4 (*)
 ++--- com.google.android.play:core:1.10.3