diff --git a/core/data/src/jvmMain/kotlin/zed/rainxch/core/data/network/HttpClientFactory.jvm.kt b/core/data/src/jvmMain/kotlin/zed/rainxch/core/data/network/HttpClientFactory.jvm.kt
index aaa4ef266..942f10aa8 100644
--- a/core/data/src/jvmMain/kotlin/zed/rainxch/core/data/network/HttpClientFactory.jvm.kt
+++ b/core/data/src/jvmMain/kotlin/zed/rainxch/core/data/network/HttpClientFactory.jvm.kt
@@ -14,6 +14,16 @@ actual fun createPlatformHttpClient(proxyConfig: ProxyConfig): HttpClient =
     HttpClient(OkHttp) {
         engine {
             config {
+                // Trust OS-installed root certificates in addition to the
+                // JVM cacerts bundle. Lets users behind TLS-intercepting
+                // tools (Watt Toolkit, Fiddler, corporate MITM) keep using
+                // the app without manually injecting certs into the JDK.
+                // Silently skipped on platforms where no OS keystore is
+                // available — default trust still applies.
+                buildOsTrustChainOrNull()?.let { chain ->
+                    sslSocketFactory(chain.socketFactory, chain.trustManager)
+                }
+
                 // Reset any inherited global SOCKS authenticator before
                 // deciding what this client needs — prevents a stale
                 // Authenticator from a previous [ProxyConfig.Socks] client
diff --git a/core/data/src/jvmMain/kotlin/zed/rainxch/core/data/network/OsTrustManager.kt b/core/data/src/jvmMain/kotlin/zed/rainxch/core/data/network/OsTrustManager.kt
new file mode 100644
index 000000000..76eafface
--- /dev/null
+++ b/core/data/src/jvmMain/kotlin/zed/rainxch/core/data/network/OsTrustManager.kt
@@ -0,0 +1,89 @@
+package zed.rainxch.core.data.network
+
+import java.security.KeyStore
+import java.security.cert.X509Certificate
+import javax.net.ssl.SSLContext
+import javax.net.ssl.SSLSocketFactory
+import javax.net.ssl.TrustManagerFactory
+import javax.net.ssl.X509TrustManager
+
+internal data class OsTrustChain(
+    val socketFactory: SSLSocketFactory,
+    val trustManager: X509TrustManager,
+)
+
+internal fun buildOsTrustChainOrNull(): OsTrustChain? {
+    val managers = buildList {
+        defaultTrustManagerOrNull()?.let { add(it) }
+        osTrustManagerOrNull()?.let { add(it) }
+    }
+    if (managers.size < 2) return null
+    val composite = CompositeX509TrustManager(managers)
+    return try {
+        val ctx = SSLContext.getInstance("TLS").apply {
+            init(null, arrayOf(composite), null)
+        }
+        OsTrustChain(ctx.socketFactory, composite)
+    } catch (_: Throwable) {
+        null
+    }
+}
+
+private fun defaultTrustManagerOrNull(): X509TrustManager? = trustManagerFromKeyStore(null)
+
+private fun osTrustManagerOrNull(): X509TrustManager? {
+    val osName = System.getProperty("os.name").orEmpty().lowercase()
+    val keyStore = when {
+        osName.contains("windows") -> loadKeyStore("Windows-ROOT")
+        osName.contains("mac") || osName.contains("darwin") -> loadKeyStore("KeychainStore")
+        else -> null
+    } ?: return null
+    return trustManagerFromKeyStore(keyStore)
+}
+
+private fun loadKeyStore(type: String): KeyStore? = try {
+    KeyStore.getInstance(type).apply { load(null, null) }
+} catch (_: Throwable) {
+    null
+}
+
+private fun trustManagerFromKeyStore(keyStore: KeyStore?): X509TrustManager? = try {
+    val tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm())
+    tmf.init(keyStore)
+    tmf.trustManagers.filterIsInstance<X509TrustManager>().firstOrNull()
+} catch (_: Throwable) {
+    null
+}
+
+private class CompositeX509TrustManager(
+    private val delegates: List<X509TrustManager>,
+) : X509TrustManager {
+    override fun checkClientTrusted(chain: Array<out X509Certificate>, authType: String) {
+        var lastError: Throwable? = null
+        for (tm in delegates) {
+            try {
+                tm.checkClientTrusted(chain, authType)
+                return
+            } catch (t: Throwable) {
+                lastError = t
+            }
+        }
+        throw lastError ?: java.security.cert.CertificateException("No trust manager accepted the chain")
+    }
+
+    override fun checkServerTrusted(chain: Array<out X509Certificate>, authType: String) {
+        var lastError: Throwable? = null
+        for (tm in delegates) {
+            try {
+                tm.checkServerTrusted(chain, authType)
+                return
+            } catch (t: Throwable) {
+                lastError = t
+            }
+        }
+        throw lastError ?: java.security.cert.CertificateException("No trust manager accepted the chain")
+    }
+
+    override fun getAcceptedIssuers(): Array<X509Certificate> =
+        delegates.flatMap { it.acceptedIssuers.toList() }.toTypedArray()
+}
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/16.json
index 911ad71c0..73407366b 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "Multi-source downloads no longer clobber each other's APK file.",
         "Shizuku-fallback installs no longer flip rows to \"installed\" prematurely.",
-        "Self-update no longer leaves apps stuck on \"Preparing to install\"."
+        "Self-update no longer leaves apps stuck on \"Preparing to install\".",
+        "Desktop now trusts OS-installed root certificates — Watt Toolkit, FastGithub, Fiddler, and corporate MITM proxies just work without keytool gymnastics."
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/ar/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/ar/16.json
index 83857c6bf..07bebbcc0 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/ar/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/ar/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "تنزيلات المصادر المتعددة لم تعد تطمس ملفات APK الخاصة ببعضها.",
         "تثبيتات Shizuku الاحتياطية لم تعد تُعلّم التطبيقات بأنها «مثبّتة» قبل الأوان.",
-        "التحديث الذاتي لم يعد يترك التطبيقات معلّقة على «التحضير للتثبيت»."
+        "التحديث الذاتي لم يعد يترك التطبيقات معلّقة على «التحضير للتثبيت».",
+        "تطبيق سطح المكتب يثق الآن بشهادات الجذر المثبَّتة في النظام — Watt Toolkit و FastGithub و Fiddler ووكلاء MITM للشركات تعمل دون الحاجة إلى استخدام keytool."
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/bn/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/bn/16.json
index 94514310e..d3fe88b03 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/bn/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/bn/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "মাল্টি-সোর্স ডাউনলোড আর একে অপরের APK ফাইল ওভাররাইট করে না।",
         "Shizuku-ফলব্যাক ইনস্টল আর অ্যাপগুলোকে আগেভাগে 'ইনস্টল হয়েছে' হিসেবে চিহ্নিত করে না।",
-        "সেলফ-আপডেট আর অ্যাপগুলোকে 'ইনস্টলের জন্য প্রস্তুত হচ্ছে' অবস্থায় আটকে রাখে না।"
+        "সেলফ-আপডেট আর অ্যাপগুলোকে 'ইনস্টলের জন্য প্রস্তুত হচ্ছে' অবস্থায় আটকে রাখে না।",
+        "ডেস্কটপ এখন OS-এ ইনস্টল করা রুট সার্টিফিকেটগুলোকে বিশ্বাস করে — Watt Toolkit, FastGithub, Fiddler আর কর্পোরেট MITM প্রক্সি keytool ছাড়াই কাজ করে।"
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/es/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/es/16.json
index 920817655..a33ca0e68 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/es/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/es/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "Las descargas multi-origen ya no se sobrescriben entre sí.",
         "Las instalaciones con respaldo Shizuku ya no marcan apps como «instaladas» antes de tiempo.",
-        "La auto-actualización ya no deja apps atascadas en «Preparando para instalar»."
+        "La auto-actualización ya no deja apps atascadas en «Preparando para instalar».",
+        "El escritorio ahora confía en los certificados raíz instalados en el sistema — Watt Toolkit, FastGithub, Fiddler y proxies MITM corporativos funcionan sin tener que usar keytool."
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/fr/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/fr/16.json
index ec6e2922d..8703973b1 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/fr/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/fr/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "Les téléchargements multi-source ne s’écrasent plus entre eux.",
         "Les installations en repli Shizuku ne marquent plus les apps comme « installées » trop tôt.",
-        "L’auto-mise à jour ne laisse plus d’apps bloquées sur « Préparation de l’installation »."
+        "L’auto-mise à jour ne laisse plus d’apps bloquées sur « Préparation de l’installation ».",
+        "Le bureau fait désormais confiance aux certificats racine installés par l’OS — Watt Toolkit, FastGithub, Fiddler et les proxys MITM d’entreprise fonctionnent sans manip keytool."
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/hi/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/hi/16.json
index e5ce2f506..a87d7088f 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/hi/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/hi/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "मल्टी-सोर्स डाउनलोड अब एक-दूसरे की APK फ़ाइल को ओवरराइट नहीं करते।",
         "Shizuku-फ़ॉलबैक इंस्टॉल अब समय से पहले ऐप को 'इंस्टॉल' के रूप में चिह्नित नहीं करते।",
-        "सेल्फ़-अपडेट अब ऐप्स को 'इंस्टॉल के लिए तैयार किया जा रहा है' पर अटका नहीं छोड़ता।"
+        "सेल्फ़-अपडेट अब ऐप्स को 'इंस्टॉल के लिए तैयार किया जा रहा है' पर अटका नहीं छोड़ता।",
+        "डेस्कटॉप अब OS में इंस्टॉल किए गए रूट सर्टिफिकेट पर भरोसा करता है — Watt Toolkit, FastGithub, Fiddler और कॉर्पोरेट MITM प्रॉक्सी keytool के बिना भी काम करते हैं।"
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/it/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/it/16.json
index 50bbdfc5e..68629a944 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/it/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/it/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "I download multi-sorgente non si sovrascrivono più a vicenda.",
         "Le installazioni con fallback Shizuku non segnano più le app come «installate» troppo presto.",
-        "L’aggiornamento automatico non lascia più app bloccate su «Preparazione all’installazione»."
+        "L’aggiornamento automatico non lascia più app bloccate su «Preparazione all’installazione».",
+        "Il desktop ora si fida dei certificati radice installati dal sistema — Watt Toolkit, FastGithub, Fiddler e i proxy MITM aziendali funzionano senza manovre con keytool."
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/ja/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/ja/16.json
index f4bff0d77..e566e0f75 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/ja/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/ja/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "複数ソースのダウンロードが互いの APK を上書きしてしまう問題を修正。",
         "Shizuku フォールバック時に「インストール済み」と早まって表示されることがなくなりました。",
-        "セルフアップデート後にアプリが「インストールの準備中」のまま固まる問題を修正。"
+        "セルフアップデート後にアプリが「インストールの準備中」のまま固まる問題を修正。",
+        "デスクトップが OS にインストール済みのルート証明書を信頼するようになりました。Watt Toolkit、FastGithub、Fiddler、社内 MITM プロキシも keytool 不要で動作します。"
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/ko/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/ko/16.json
index 3747fe9de..161e10cdf 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/ko/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/ko/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "다중 소스 다운로드가 서로의 APK 파일을 덮어쓰던 문제를 수정했습니다.",
         "Shizuku 폴백 설치가 시스템 확정 전에 ‘설치됨’으로 표시되던 문제를 수정했습니다.",
-        "셀프 업데이트 후 앱이 ‘설치 준비 중’ 상태로 멈춰 있던 문제를 수정했습니다."
+        "셀프 업데이트 후 앱이 ‘설치 준비 중’ 상태로 멈춰 있던 문제를 수정했습니다.",
+        "데스크톱이 OS에 설치된 루트 인증서를 신뢰합니다 — Watt Toolkit, FastGithub, Fiddler, 사내 MITM 프록시가 keytool 작업 없이 그대로 동작합니다."
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/pl/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/pl/16.json
index 6b7eeb00e..c6a60bf2a 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/pl/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/pl/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "Pobierania z wielu źródeł nie nadpisują już swoich plików APK.",
         "Instalacje z trybem awaryjnym Shizuku nie oznaczają już aplikacji jako „zainstalowanych” przedwcześnie.",
-        "Auto-aktualizacja nie zostawia już aplikacji w stanie „Przygotowywanie instalacji”."
+        "Auto-aktualizacja nie zostawia już aplikacji w stanie „Przygotowywanie instalacji”.",
+        "Wersja desktopowa ufa teraz certyfikatom głównym zainstalowanym w systemie — Watt Toolkit, FastGithub, Fiddler i firmowe proxy MITM działają bez kombinowania z keytool."
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/ru/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/ru/16.json
index b4a41ad98..39d6c25d4 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/ru/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/ru/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "Загрузки из нескольких источников больше не затирают APK друг друга.",
         "Установка через Shizuku-fallback больше не помечает приложения как «установленные» раньше времени.",
-        "Самообновление больше не оставляет приложения зависшими на статусе «Подготовка к установке»."
+        "Самообновление больше не оставляет приложения зависшими на статусе «Подготовка к установке».",
+        "Десктоп теперь доверяет корневым сертификатам, установленным в ОС — Watt Toolkit, FastGithub, Fiddler и корпоративные MITM-прокси работают без шаманства с keytool."
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/tr/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/tr/16.json
index 33deac8de..a6a728445 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/tr/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/tr/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "Çoklu kaynaklı indirmeler artık birbirinin APK dosyasını ezmez.",
         "Shizuku yedekli kurulumlar uygulamaları artık erkenden “kuruldu” olarak işaretlemez.",
-        "Otomatik güncelleme uygulamaları artık “Yüklemeye hazırlanıyor” durumunda asılı bırakmaz."
+        "Otomatik güncelleme uygulamaları artık “Yüklemeye hazırlanıyor” durumunda asılı bırakmaz.",
+        "Masaüstü artık işletim sistemine yüklü kök sertifikalara güveniyor — Watt Toolkit, FastGithub, Fiddler ve kurumsal MITM proxy'leri keytool uğraşı olmadan çalışıyor."
       ]
     }
   ]
diff --git a/core/presentation/src/commonMain/composeResources/files/whatsnew/zh-CN/16.json b/core/presentation/src/commonMain/composeResources/files/whatsnew/zh-CN/16.json
index 5bd975615..07db4b9c5 100644
--- a/core/presentation/src/commonMain/composeResources/files/whatsnew/zh-CN/16.json
+++ b/core/presentation/src/commonMain/composeResources/files/whatsnew/zh-CN/16.json
@@ -31,7 +31,8 @@
       "bullets": [
         "修复多源下载相互覆盖 APK 文件的问题。",
         "修复 Shizuku 回退安装时,应用提前被标记为「已安装」的问题。",
-        "修复自动更新后应用卡在「准备安装」状态的问题。"
+        "修复自动更新后应用卡在「准备安装」状态的问题。",
+        "桌面端现在信任系统已安装的根证书 — Watt Toolkit、FastGithub、Fiddler 以及企业 MITM 代理无需折腾 keytool 即可使用。"
       ]
     }
   ]