diff --git a/go.mod b/go.mod
index 47b200f..50e375b 100644
--- a/go.mod
+++ b/go.mod
@@ -5,5 +5,5 @@ go 1.19
 require (
 	github.com/frozzare/go v1.0.0
 	github.com/frozzare/go-assert v1.1.0
-	github.com/personnummer/go/v3 v3.1.0
+	github.com/personnummer/go/v3 v3.1.2
 )
diff --git a/go.sum b/go.sum
index 71b16a5..fc2e955 100644
--- a/go.sum
+++ b/go.sum
@@ -6,3 +6,5 @@ github.com/personnummer/go/v3 v3.0.2 h1:tBm+nBmD6NhfazoMV9oUDxXZHMghYhKEmWsnPcJs
 github.com/personnummer/go/v3 v3.0.2/go.mod h1:VGi8cG/kgQ9c4p8qCTRWxV1IAWUpAf2VF6137TL/Oq0=
 github.com/personnummer/go/v3 v3.1.0 h1:Bqq6CV9aBrsz+g84Gbyge6rCmpr2uKK//opoJz+3d3M=
 github.com/personnummer/go/v3 v3.1.0/go.mod h1:piLpoILajZ4xgNA53uzWdTb6VNgYPs4uWdhuTjdHuEM=
+github.com/personnummer/go/v3 v3.1.2 h1:pQFk14wsPtSX6WdjhEn7rabg2/NAjGBI3liju2Imgs8=
+github.com/personnummer/go/v3 v3.1.2/go.mod h1:piLpoILajZ4xgNA53uzWdTb6VNgYPs4uWdhuTjdHuEM=
diff --git a/vendor/github.com/personnummer/go/v3/README.md b/vendor/github.com/personnummer/go/v3/README.md
index 3cc39f5..5a8e0ae 100644
--- a/vendor/github.com/personnummer/go/v3/README.md
+++ b/vendor/github.com/personnummer/go/v3/README.md
@@ -1,4 +1,4 @@
-# personnummer [![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/personnummer/go/go.yml?branch=master)](https://github.com/personnummer/go/actions) [![GoDoc](https://godoc.org/github.com/personnummer/go?status.svg)](https://godoc.org/github.com/personnummer/go) [![Go Report Card](https://goreportcard.com/badge/github.com/personnummer/go)](https://goreportcard.com/report/github.com/personnummer/go)
+# personnummer [![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/personnummer/go/go.yml?branch=master)](https://github.com/personnummer/go/actions) [![GoDoc](https://godoc.org/github.com/personnummer/go?status.svg)](https://pkg.go.dev/github.com/personnummer/go/v3) [![Go Report Card](https://goreportcard.com/badge/github.com/personnummer/go)](https://goreportcard.com/report/github.com/personnummer/go)
 
 Validate Swedish personal identity numbers.
 
diff --git a/vendor/github.com/personnummer/go/v3/personnummer.go b/vendor/github.com/personnummer/go/v3/personnummer.go
index b71e0c6..2408a8c 100644
--- a/vendor/github.com/personnummer/go/v3/personnummer.go
+++ b/vendor/github.com/personnummer/go/v3/personnummer.go
@@ -7,6 +7,7 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode"
 )
 
 const (
@@ -106,6 +107,12 @@ func getCoOrdinationDay(day []byte) []byte {
 
 // luhn will test if the given string is a valid luhn string.
 func luhn(s []byte) bool {
+	for _, c := range s {
+		if !unicode.IsNumber(rune(c)) {
+			return false
+		}
+	}
+
 	odd := len(s) & 1
 
 	var sum int
@@ -204,12 +211,6 @@ func (p *Personnummer) parse(pin string, options *Options) error {
 
 	dateBytes := getCleanNumber(pin)
 
-	if len(dateBytes) == 0 || len(dateBytes) < 8 {
-		return errInvalidSecurityNumber
-	}
-
-	plus := strings.Contains(pin, "+")
-
 	switch len(dateBytes) {
 	case lengthWithCentury:
 		century = string(dateBytes[0:2])
@@ -224,6 +225,8 @@ func (p *Personnummer) parse(pin string, options *Options) error {
 		check = string(dateBytes[9:])
 		dateBytes = dateBytes[0:6]
 		break
+	default:
+		return errInvalidSecurityNumber
 	}
 
 	if num == "000" {
@@ -240,6 +243,8 @@ func (p *Personnummer) parse(pin string, options *Options) error {
 		}
 	}
 
+	plus := strings.Contains(pin, "+")
+
 	p.Century = century
 	p.Year = year
 	p.FullYear = toString(century + year)
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 243c4c7..4918d67 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -4,6 +4,6 @@ github.com/frozzare/go/http2
 # github.com/frozzare/go-assert v1.1.0
 ## explicit
 github.com/frozzare/go-assert
-# github.com/personnummer/go/v3 v3.1.0
+# github.com/personnummer/go/v3 v3.1.2
 ## explicit; go 1.20
 github.com/personnummer/go/v3