diff --git a/app/src/main/assets/yacd.version.txt b/app/src/main/assets/yacd.version.txt
index 56a6051..d8263ee 100644
--- a/app/src/main/assets/yacd.version.txt
+++ b/app/src/main/assets/yacd.version.txt
@@ -1 +1 @@
-1
\ No newline at end of file
+2
\ No newline at end of file
diff --git a/app/src/main/assets/yacd.zip b/app/src/main/assets/yacd.zip
index 46d2b59..fba573c 100644
Binary files a/app/src/main/assets/yacd.zip and b/app/src/main/assets/yacd.zip differ
diff --git a/buildScript/lib/core/get_source_env.sh b/buildScript/lib/core/get_source_env.sh
index e6436f2..f94764a 100644
--- a/buildScript/lib/core/get_source_env.sh
+++ b/buildScript/lib/core/get_source_env.sh
@@ -1,5 +1,5 @@
 if [ ! -z $ENV_NB4A ]; then
-  export COMMIT_SING_BOX_EXTRA="c61e8ae9d227a918e85fcd22fb36d89a0ad9a661"
+  export COMMIT_SING_BOX_EXTRA="1ea593f166ddb44e12ba9c7b41bcc6e73b66b550"
 fi
 
 if [ ! -z $ENV_SING_BOX_EXTRA ]; then
diff --git a/libcore/certs.go b/libcore/certs.go
new file mode 100644
index 0000000..00a98db
--- /dev/null
+++ b/libcore/certs.go
@@ -0,0 +1,24 @@
+package libcore
+
+import (
+	"crypto/x509"
+	"log"
+	_ "unsafe" // for go:linkname
+)
+
+//go:linkname systemRoots crypto/x509.systemRoots
+var systemRoots *x509.CertPool
+
+func updateRootCACerts(pem []byte) {
+	x509.SystemCertPool()
+	roots := x509.NewCertPool()
+	if !roots.AppendCertsFromPEM(pem) {
+		log.Println("failed to append certificates from pem")
+		return
+	}
+	systemRoots = roots
+	log.Println("external ca.pem was loaded")
+}
+
+//go:linkname initSystemRoots crypto/x509.initSystemRoots
+func initSystemRoots()
diff --git a/libcore/nb4a.go b/libcore/nb4a.go
index 67650a8..adbac65 100644
--- a/libcore/nb4a.go
+++ b/libcore/nb4a.go
@@ -78,6 +78,12 @@ func InitCore(process, cachePath, internalAssets, externalAssets string,
 			outdated = "Your version is too old! Please update!! 版本太旧，请升级！"
 		}
 
+		// certs
+		pem, err := os.ReadFile(externalAssetsPath + "ca.pem")
+		if err == nil {
+			updateRootCACerts(pem)
+		}
+
 		// bg
 		if isBgProcess {
 			extractAssets()