diff --git a/src/zh/yimmh/build.gradle b/src/zh/yimmh/build.gradle
index d99c3b8ae..d461af204 100644
--- a/src/zh/yimmh/build.gradle
+++ b/src/zh/yimmh/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'Yimmh'
     pkgNameSuffix = 'zh.yimmh'
     extClass = '.Yimmh'
-    extVersionCode = 4
+    extVersionCode = 5
 }
 
 apply from: "$rootDir/common.gradle"
diff --git a/src/zh/yimmh/src/eu/kanade/tachiyomi/extension/zh/yimmh/Yimmh.kt b/src/zh/yimmh/src/eu/kanade/tachiyomi/extension/zh/yimmh/Yimmh.kt
index 61a1fd422..a93e2f2f7 100644
--- a/src/zh/yimmh/src/eu/kanade/tachiyomi/extension/zh/yimmh/Yimmh.kt
+++ b/src/zh/yimmh/src/eu/kanade/tachiyomi/extension/zh/yimmh/Yimmh.kt
@@ -29,7 +29,7 @@ class Yimmh : ParsedHttpSource() {
     override val supportsLatest: Boolean = true
     override val baseUrl: String = "https://m.yimmh.com"
     override fun headersBuilder() = Headers.Builder()
-        .add("User-Agent", "Mozilla/5.0 (Android 11; Mobile; rv:83.0) Gecko/83.0 Firefox/83.0")
+        .add("User-Agent", System.getProperty("http.agent")!!)
     override val client: OkHttpClient = getUnsafeOkHttpClient()
 
     // Trusted all certificates