diff --git a/acme/autocert/autocert_test.go b/acme/autocert/autocert_test.go
index 59f39c1..927efb9 100644
--- a/acme/autocert/autocert_test.go
+++ b/acme/autocert/autocert_test.go
@@ -226,11 +226,11 @@
 	man := &Manager{Prompt: AcceptTOS}
 	defer man.stopRenew()
 
-	hello := clientHelloInfo("σσσ.com", algECDSA)
-	testGetCertificate(t, man, "xn--4xaaa.com", hello)
+	hello := clientHelloInfo("éé.com", algECDSA)
+	testGetCertificate(t, man, "xn--9caa.com", hello)
 
-	hello = clientHelloInfo("σςΣ.com", algECDSA)
-	testGetCertificate(t, man, "xn--4xaaa.com", hello)
+	hello = clientHelloInfo("éÉ.com", algECDSA)
+	testGetCertificate(t, man, "xn--9caa.com", hello)
 }
 
 func TestGetCertificate_mixedcase(t *testing.T) {
@@ -949,14 +949,14 @@
 }
 
 func TestHostWhitelist(t *testing.T) {
-	policy := HostWhitelist("example.com", "EXAMPLE.ORG", "*.example.net", "σςΣ.com")
+	policy := HostWhitelist("example.com", "EXAMPLE.ORG", "*.example.net", "éÉ.com")
 	tt := []struct {
 		host  string
 		allow bool
 	}{
 		{"example.com", true},
 		{"example.org", true},
-		{"xn--4xaaa.com", true},
+		{"xn--9caa.com", true}, // éé.com
 		{"one.example.com", false},
 		{"two.example.org", false},
 		{"three.example.net", false},
diff --git a/go.mod b/go.mod
index 6a856d3..525ffa6 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,9 @@
 go 1.17
 
 require (
-	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
+	golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2
 	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1
 	golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1
-	golang.org/x/text v0.3.3 // indirect
 )
+
+require golang.org/x/text v0.3.6 // indirect
diff --git a/go.sum b/go.sum
index 0926c06..cccfa80 100644
--- a/go.sum
+++ b/go.sum
@@ -1,10 +1,11 @@
-golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 h1:qWPm9rbaAMKs8Bq/9LRpbMqxWRVUAQwMI9fVrssnTfw=
-golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2 h1:CIJ76btIcR3eFI5EgSo6k1qKw9KJexJuRLI9G7Hp5wE=
+golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 h1:SrN+KX8Art/Sf4HNj6Zcz06G7VEz+7w9tdXTPOZ7+l4=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=