diff --git a/go.mod b/go.mod
index 8514b77..e7f9afd 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,10 @@
-module git.icod.de/essentials/mailer
+module code.icod.de/essentials/mailer
 
-go 1.13
+go 1.21
 
 require github.com/go-mail/mail v2.3.1+incompatible
+
+require (
+	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
+	gopkg.in/mail.v2 v2.3.1 // indirect
+)
diff --git a/go.sum b/go.sum
index 79c887a..6bc9e25 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,6 @@
 github.com/go-mail/mail v2.3.1+incompatible h1:UzNOn0k5lpfVtO31cK3hn6I4VEVGhe3lX8AJBAxXExM=
 github.com/go-mail/mail v2.3.1+incompatible/go.mod h1:VPWjmmNyRsWXQZHVHT3g0YbIINUkSmuKOiLIDkWbL6M=
+gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc h1:2gGKlE2+asNV9m7xrywl36YYNnBG5ZQ0r/BOOxqPpmk=
+gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc/go.mod h1:m7x9LTH6d71AHyAX77c9yqWCCa3UKHcVEj9y7hAtKDk=
+gopkg.in/mail.v2 v2.3.1 h1:WYFn/oANrAGP2C0dcV6/pbkPzv8yGzqTjPmTeO7qoXk=
+gopkg.in/mail.v2 v2.3.1/go.mod h1:htwXN1Qh09vZJ1NVKxQqHPBaCBbzKhp5GzuJEA4VJWw=