diff --git a/go.mod b/go.mod
index 22fe409..4b9362a 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/ushis/mailhook
 go 1.14
 
 require (
-	github.com/chrj/smtpd v0.2.0
+	github.com/chrj/smtpd v0.3.0
 	github.com/go-test/deep v1.0.3 // indirect
 	github.com/gogs/chardet v0.0.0-20191104214054-4b6791f73a28 // indirect
 	github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7 // indirect
diff --git a/go.sum b/go.sum
index 9d5e776..6e71161 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,7 @@ github.com/chrj/smtpd v0.1.2 h1:yWaMOCmnPlcNgJzkak1TBhhkObAfomd+NmZG5epdO88=
 github.com/chrj/smtpd v0.1.2/go.mod h1:jt4ydELuZmqhn9hn3YpEPV1dY00aOB+Q1nWXnBDFKeY=
 github.com/chrj/smtpd v0.2.0 h1:QGbE4UQz7sKjvXpRgNLuiBOjcWTzBKu/dj0hyDLpD14=
 github.com/chrj/smtpd v0.2.0/go.mod h1:1hmG9KbrE10JG1SmvG79Krh4F6713oUrw2+gRp1oSYk=
+github.com/chrj/smtpd v0.3.0/go.mod h1:1hmG9KbrE10JG1SmvG79Krh4F6713oUrw2+gRp1oSYk=
 github.com/eaigner/dkim v0.0.0-20150301120808-6fe4a7ee9cfb/go.mod h1:FSCIHbrqk7D01Mj8y/jW+NS1uoCerr+ad+IckTHTFf4=
 github.com/go-test/deep v1.0.2/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
 github.com/go-test/deep v1.0.3 h1:ZrJSEWsXzPOxaZnFteGEfooLba+ju3FYIbOrS+rQd68=