diff --git a/go.mod b/go.mod
index 65488a5df4adfa9655bdcd80c13393af4fbc9795..46cb745beca051a94d756503823dfa215b8e42ce 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module git.autistici.org/ai3/tools/smtpd-pipe
 
-go 1.16
+go 1.20
 
 require github.com/chrj/smtpd v0.3.1