diff --git a/go.mod b/go.mod
index 972e99897f411069feac01f77bd7f8a2f7b704f6..e2da8e75d34c32710ff11240984c33caf31ee592 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module git.autistici.org/ai3/tools/smtpd-pipe
 
-require github.com/chrj/smtpd v0.2.0
+go 1.16
+
+require github.com/chrj/smtpd v0.3.0
diff --git a/go.sum b/go.sum
index 6dec56f9920b3126677d2b6e331cc9d4ea44b9aa..7521695a646ab51024bda8b721ae8660b1b1b800 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
 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 h1:cw1LSHDOz7N3XbkcZSF/bue9dh7ATKk5ZksfBztV6b0=
+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=