diff --git a/src/en/kenscans/build.gradle b/src/en/kenscans/build.gradle
index 95714c9c9..6fd4b6952 100644
--- a/src/en/kenscans/build.gradle
+++ b/src/en/kenscans/build.gradle
@@ -1,9 +1,9 @@
 ext {
     extName = 'Ken Scans'
     extClass = '.KenScans'
-    themePkg = 'keyoapp'
+    themePkg = 'iken'
     baseUrl = 'https://kenscans.com'
-    overrideVersionCode = 0
+    overrideVersionCode = 8
     isNsfw = false
 }
 
diff --git a/src/en/kenscans/src/eu/kanade/tachiyomi/extension/en/kenscans/KenScans.kt b/src/en/kenscans/src/eu/kanade/tachiyomi/extension/en/kenscans/KenScans.kt
index 8d90e8a12..06dae19da 100644
--- a/src/en/kenscans/src/eu/kanade/tachiyomi/extension/en/kenscans/KenScans.kt
+++ b/src/en/kenscans/src/eu/kanade/tachiyomi/extension/en/kenscans/KenScans.kt
@@ -1,9 +1,32 @@
 package eu.kanade.tachiyomi.extension.en.kenscans
 
-import eu.kanade.tachiyomi.multisrc.keyoapp.Keyoapp
+import eu.kanade.tachiyomi.multisrc.iken.Iken
+import eu.kanade.tachiyomi.source.model.Page
+import eu.kanade.tachiyomi.source.model.SManga
+import okhttp3.Request
+import okhttp3.Response
 
-class KenScans : Keyoapp(
+class KenScans : Iken(
     "Ken Scans",
-    "https://kenscans.com",
     "en",
-)
+    "https://kenscans.com",
+    "https://api.kenscans.com",
+) {
+    override fun chapterListRequest(manga: SManga): Request {
+        // Migration from old web theme to the new one(Keyoapp -> Iken)
+        if (manga.url.startsWith("/series/")) {
+            throw Exception("Migrate from $name to $name (same extension)")
+        }
+        return super.chapterListRequest(manga)
+    }
+
+    override fun pageListParse(response: Response): List<Page> {
+        // Migration from old web theme to the new one(Keyoapp -> Iken)
+        val url = response.request.url.toString().substringAfter(baseUrl)
+        if (url.startsWith("/chapter/")) {
+            throw Exception("Migrate from $name to $name (same extension)")
+        }
+
+        return super.pageListParse(response)
+    }
+}