diff --git a/go.mod b/go.mod
index 363c2564..922aab84 100644
--- a/go.mod
+++ b/go.mod
@@ -2,11 +2,9 @@ module github.com/sacloud/autoscaler
 
 go 1.21
 
-replace github.com/go-playground/validator/v10 => github.com/go-playground/validator/v10 v10.15.4
-
 require (
 	github.com/c-robinson/iplib v1.0.8
-	github.com/go-playground/validator/v10 v10.16.0
+	github.com/go-playground/validator/v10 v10.20.0
 	github.com/goccy/go-yaml v1.11.3
 	github.com/hashicorp/errwrap v1.1.0
 	github.com/hashicorp/go-multierror v1.1.1
diff --git a/go.sum b/go.sum
index 7e62dc3d..9bd1999f 100644
--- a/go.sum
+++ b/go.sum
@@ -53,8 +53,8 @@ github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/o
 github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
 github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
 github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
-github.com/go-playground/validator/v10 v10.15.4 h1:zMXza4EpOdooxPel5xDqXEdXG5r+WggpvnAKMsalBjs=
-github.com/go-playground/validator/v10 v10.15.4/go.mod h1:9iXMNT7sEkjXb0I+enO7QXmzG6QCsPWY4zveKFVRSyU=
+github.com/go-playground/validator/v10 v10.20.0 h1:K9ISHbSaI0lyB2eWMPJo+kOS/FBExVwjEviJTixqxL8=
+github.com/go-playground/validator/v10 v10.20.0/go.mod h1:dbuPbCMFw/DrkbEynArYaCwl3amGuJotoKCe95atGMM=
 github.com/goccy/go-yaml v1.11.3 h1:B3W9IdWbvrUu2OYQGwvU1nZtvMQJPBKgBUuweJjLj6I=
 github.com/goccy/go-yaml v1.11.3/go.mod h1:wKnAMd44+9JAAnGQpWVEgBzGt3YuTaQ4uXoHvE4m7WU=
 github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
diff --git a/validate/validate.go b/validate/validate.go
index a76aa164..99d9583e 100644
--- a/validate/validate.go
+++ b/validate/validate.go
@@ -16,6 +16,8 @@ package validate
 
 import (
 	"fmt"
+	"log"
+	"net"
 	"reflect"
 	"strings"
 
@@ -23,10 +25,9 @@ import (
 	"github.com/hashicorp/go-multierror"
 )
 
-var validatorInstance = validator.New()
-
-func validate(v interface{}) error {
-	validatorInstance.RegisterTagNameFunc(func(fld reflect.StructField) string {
+var validatorInstance = func() *validator.Validate {
+	v := validator.New()
+	v.RegisterTagNameFunc(func(fld reflect.StructField) string {
 		name := strings.SplitN(fld.Tag.Get("name"), ",", 2)[0]
 		if name == "" {
 			// nameタグがない場合はyamlタグを参照
@@ -37,6 +38,19 @@ func validate(v interface{}) error {
 		}
 		return name
 	})
+	if err := v.RegisterValidation("cidrv4", customCIDRv4Validator); err != nil {
+		log.Printf("Init validator failed: %s", err)
+	}
+	return v
+}()
+
+// customCIDRv4Validator cidrv4をhttps://github.com/go-playground/validator/pull/945 以前の動作にするためのカスタムバリデーター
+func customCIDRv4Validator(fl validator.FieldLevel) bool {
+	ip, _, err := net.ParseCIDR(fl.Field().String())
+	return err == nil && ip.To4() != nil
+}
+
+func validate(v interface{}) error {
 	return validatorInstance.Struct(v)
 }