diff --git a/app/build.gradle b/app/build.gradle
index 0a4dea6..da2109d 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -38,6 +38,9 @@ android {
     }
     kotlinOptions {
         jvmTarget = '1.8'
+        kotlin.sourceSets.all {
+            languageSettings.optIn("kotlin.RequiresOptIn")
+        }
     }
     namespace 'org.mosad.teapod'
 }
diff --git a/app/src/main/java/org/mosad/teapod/parser/crunchyroll/Crunchyroll.kt b/app/src/main/java/org/mosad/teapod/parser/crunchyroll/Crunchyroll.kt
index e80a9ad..9a4a9e7 100644
--- a/app/src/main/java/org/mosad/teapod/parser/crunchyroll/Crunchyroll.kt
+++ b/app/src/main/java/org/mosad/teapod/parser/crunchyroll/Crunchyroll.kt
@@ -33,8 +33,6 @@ import io.ktor.client.request.forms.*
 import io.ktor.client.statement.*
 import io.ktor.http.*
 import kotlinx.coroutines.*
-import kotlinx.coroutines.sync.Mutex
-import kotlinx.coroutines.sync.withLock
 import kotlinx.serialization.SerializationException
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonObject
@@ -59,7 +57,8 @@ object Crunchyroll {
 
     private lateinit var token: Token
     private var tokenValidUntil: Long = 0
-    private val tokeRefreshMutex = Mutex()
+    @OptIn(DelicateCoroutinesApi::class)
+    private val tokenRefreshContext = newSingleThreadContext("TokenRefreshContext")
 
     private var accountID = ""
 
@@ -141,8 +140,7 @@ object Crunchyroll {
         params: List<Pair<String, Any?>> = listOf(),
         bodyObject: Any = Any()
     ): T = coroutineScope {
-        // TODO find a better way to make token refresh thread safe, currently it's blocking
-        tokeRefreshMutex.withLock {
+        withContext(tokenRefreshContext) {
             if (System.currentTimeMillis() > tokenValidUntil) refreshToken()
         }