diff --git a/nkatago/engine_analysis.go b/nkatago/engine_analysis.go
index 40885b0..3f39985 100644
--- a/nkatago/engine_analysis.go
+++ b/nkatago/engine_analysis.go
@@ -4,7 +4,7 @@ import (
 	"git.noahlan.cn/noahlan/ntool-biz/nkatago/req"
 	"git.noahlan.cn/noahlan/ntool-biz/nkatago/resp"
 	"git.noahlan.cn/noahlan/ntool/ndef"
-	"git.noahlan.cn/noahlan/ntool/ngo/codec"
+	"git.noahlan.cn/noahlan/ntool/njson"
 	"git.noahlan.cn/noahlan/ntool/nrandom"
 	"git.noahlan.cn/noahlan/ntool/nstr"
 	"git.noahlan.cn/noahlan/ntool/nsys/cmdn"
@@ -39,7 +39,7 @@ func NewAnalysisEngine(name string, args ...string) (*AnalysisEngine, error) {
 	engine := &AnalysisEngine{KatagoEngine: &KatagoEngine{
 		Processor: cmdn.NewProcessor(
 			false,
-			cmdn.WithSerializer(codec.NewJsonSerializer()),
+			cmdn.WithSerializer(njson.NewJsonSerializer()),
 			cmdn.WithStartupDecidedFunc(analStartupDecidedFunc),
 			cmdn.WithEndLineDecidedFunc(analEndLineDecidedFunc),
 			cmdn.WithReadIDFunc(analReadIDFunc),