diff --git a/regexes.go b/regexes.go
index 3f79c61..71ccd97 100644
--- a/regexes.go
+++ b/regexes.go
@@ -35,8 +35,8 @@ const (
 	latitudeRegexString              = "^[-+]?([1-8]?\\d(\\.\\d+)?|90(\\.0+)?)$"
 	longitudeRegexString             = "^[-+]?(180(\\.0+)?|((1[0-7]\\d)|([1-9]?\\d))(\\.\\d+)?)$"
 	sSNRegexString                   = `^\d{3}[- ]?\d{2}[- ]?\d{4}$`
-	hostnameRegexStringRFC952        = `^[a-zA-Z][a-zA-Z0-9\-\.]+[a-z-Az0-9]$`    // https://tools.ietf.org/html/rfc952
-	hostnameRegexStringRFC1123       = `^[a-zA-Z0-9][a-zA-Z0-9\-\.]+[a-z-Az0-9]$` // accepts hostname starting with a digit https://tools.ietf.org/html/rfc1123
+	hostnameRegexStringRFC952        = `^[a-zA-Z][a-zA-Z0-9\-\.]+[a-zA-Z0-9]$`    // https://tools.ietf.org/html/rfc952
+	hostnameRegexStringRFC1123       = `^[a-zA-Z0-9][a-zA-Z0-9\-\.]+[a-zA-Z0-9]$` // accepts hostname starting with a digit https://tools.ietf.org/html/rfc1123
 	btcAddressRegexString            = `^[13][a-km-zA-HJ-NP-Z1-9]{25,34}$`        // bitcoin address
 	btcAddressUpperRegexStringBech32 = `^BC1[02-9AC-HJ-NP-Z]{7,76}$`              // bitcoin bech32 address https://en.bitcoin.it/wiki/Bech32
 	btcAddressLowerRegexStringBech32 = `^bc1[02-9ac-hj-np-z]{7,76}$`              // bitcoin bech32 address https://en.bitcoin.it/wiki/Bech32
diff --git a/validator_test.go b/validator_test.go
index aded71f..46e67da 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -7846,6 +7846,7 @@ func TestHostnameRFC952Validation(t *testing.T) {
 		{"test.example24.com", true},
 		{"test24.example24.com", true},
 		{"example", true},
+		{"EXAMPLE", true},
 		{"1.foo.com", false},
 		{"test.example.com.", false},
 		{"example.com.", false},