diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2cc205e45..97ba89e30 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 
 ### Fixed
 - Fix MAL `main_picture` nullability breaking search if a result doesn't have a cover set ([@MajorTanya](https://github.com/MajorTanya)) ([#1618](https://github.com/mihonapp/mihon/pull/1618))
+- Fix Bangumi tracking 401 errors due to Mihon sending expired credentials ([@MajorTanya](https://github.com/MajorTanya)) ([#1681](https://github.com/mihonapp/mihon/pull/1681))
 
 ### Other
 - Add zoned "Current time" to debug info and include year & timezone in logcat output ([@MajorTanya](https://github.com/MajorTanya)) ([#1672](https://github.com/mihonapp/mihon/pull/1672))
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/track/bangumi/BangumiInterceptor.kt b/app/src/main/java/eu/kanade/tachiyomi/data/track/bangumi/BangumiInterceptor.kt
index 29a3c30ef..e77def78c 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/track/bangumi/BangumiInterceptor.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/track/bangumi/BangumiInterceptor.kt
@@ -21,12 +21,13 @@ class BangumiInterceptor(private val bangumi: Bangumi) : Interceptor {
     override fun intercept(chain: Interceptor.Chain): Response {
         val originalRequest = chain.request()
 
-        val currAuth = oauth ?: throw Exception("Not authenticated with Bangumi")
+        var currAuth: BGMOAuth = oauth ?: throw Exception("Not authenticated with Bangumi")
 
         if (currAuth.isExpired()) {
             val response = chain.proceed(BangumiApi.refreshTokenRequest(currAuth.refreshToken!!))
             if (response.isSuccessful) {
-                newAuth(json.decodeFromString<BGMOAuth>(response.body.string()))
+                currAuth = json.decodeFromString<BGMOAuth>(response.body.string())
+                newAuth(currAuth)
             } else {
                 response.close()
             }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/track/bangumi/dto/BGMOAuth.kt b/app/src/main/java/eu/kanade/tachiyomi/data/track/bangumi/dto/BGMOAuth.kt
index 6a4fea3cb..9ac1308a9 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/track/bangumi/dto/BGMOAuth.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/track/bangumi/dto/BGMOAuth.kt
@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.data.track.bangumi.dto
 
+import kotlinx.serialization.EncodeDefault
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
@@ -10,6 +11,7 @@ data class BGMOAuth(
     @SerialName("token_type")
     val tokenType: String,
     @SerialName("created_at")
+    @EncodeDefault
     val createdAt: Long = System.currentTimeMillis() / 1000,
     @SerialName("expires_in")
     val expiresIn: Long,