diff --git a/go.mod b/go.mod
index d980ee3780..c16b4b0a71 100644
--- a/go.mod
+++ b/go.mod
@@ -24,7 +24,7 @@ require (
 	github.com/lovoo/gcloud-opentracing v0.3.0
 	github.com/miekg/dns v1.1.8
 	github.com/minio/minio-go v0.0.0-20190131015406-c8a261de75c1
-	github.com/mozillazg/go-cos v0.11.0
+	github.com/mozillazg/go-cos v0.12.0
 	github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223
 	github.com/oklog/run v1.0.0
 	github.com/oklog/ulid v1.3.1
diff --git a/go.sum b/go.sum
index fe6c09e941..c0fd8ca18e 100644
--- a/go.sum
+++ b/go.sum
@@ -183,6 +183,8 @@ github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lN
 github.com/montanaflynn/stats v0.0.0-20180911141734-db72e6cae808/go.mod h1:wL8QJuTMNUDYhXwkmfOly8iTdp5TEcJFWZD2D7SIkUc=
 github.com/mozillazg/go-cos v0.11.0 h1:PUaIGDL6Jxgrzqg0XvZ6y32jS/5z26+UxnX6ENMm7yE=
 github.com/mozillazg/go-cos v0.11.0/go.mod h1:Zp6DvvXn0RUOXGJ2chmWt2bLEqRAnJnS3DnAZsJsoaE=
+github.com/mozillazg/go-cos v0.12.0 h1:b9hUd5HjrDe10BUfkyiLYI1+z4M2kAgKasktszx9pO4=
+github.com/mozillazg/go-cos v0.12.0/go.mod h1:Zp6DvvXn0RUOXGJ2chmWt2bLEqRAnJnS3DnAZsJsoaE=
 github.com/mozillazg/go-httpheader v0.2.1 h1:geV7TrjbL8KXSyvghnFm+NyTux/hxwueTSrwhe88TQQ=
 github.com/mozillazg/go-httpheader v0.2.1/go.mod h1:jJ8xECTlalr6ValeXYdOF8fFUISeBAdw6E61aqQma60=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223 h1:F9x/1yl3T2AeKLr2AMdilSD8+f9bvMnNN8VS5iDtovc=