diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 5202b13..0ebe13d 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -33,3 +33,8 @@
 -dontwarn org.conscrypt.**
 -dontwarn org.bouncycastle.**
 -dontwarn org.openjsse.**
+
+# ─── Tink / EncryptedSharedPreferences (androidx.security-crypto) ─────────────
+# Tink references compile-only Error Prone annotations that aren't on the runtime
+# classpath; they're not needed at runtime, so silence the missing-class errors.
+-dontwarn com.google.errorprone.annotations.**
diff --git a/app/src/main/java/no/svorka/mcms/core/ApiClient.kt b/app/src/main/java/no/svorka/mcms/core/ApiClient.kt
index f44274b..8c5946c 100644
--- a/app/src/main/java/no/svorka/mcms/core/ApiClient.kt
+++ b/app/src/main/java/no/svorka/mcms/core/ApiClient.kt
@@ -1,6 +1,7 @@
 package no.svorka.mcms.core
 
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.JsonElement
@@ -24,6 +25,7 @@ import kotlin.coroutines.resumeWithException
 private fun Response.closeQuietly() { runCatching { close() } }
 
 /** Suspend bridge for an OkHttp call, with coroutine cancellation. */
+@OptIn(ExperimentalCoroutinesApi::class)   // resume(value) { onCancellation } overload
 suspend fun Call.await(): Response = suspendCancellableCoroutine { cont ->
     enqueue(object : Callback {
         override fun onResponse(call: Call, response: Response) {