diff --git a/README.md b/README.md
index 6c14bbf..3c9366c 100644
--- a/README.md
+++ b/README.md
@@ -666,6 +666,7 @@ Below is the whole list of the rules provided by the `is` package:
 * `UUIDv4`: validates if a string is a valid version 4 UUID
 * `UUIDv5`: validates if a string is a valid version 5 UUID
 * `UUID`: validates if a string is a valid UUID
+* `ULID`: validates if a string is a valid ULID
 * `CreditCard`: validates if a string is a valid credit card number
 * `ISBN10`: validates if a string is an ISBN version 10
 * `ISBN13`: validates if a string is an ISBN version 13
diff --git a/go.mod b/go.mod
index 359af94..e9e5761 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,6 @@ module github.com/go-ozzo/ozzo-validation/v4
 go 1.13
 
 require (
-	github.com/asaskevich/govalidator v0.0.0-20200108200545-475eaeb16496
+	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d
 	github.com/stretchr/testify v1.4.0
 )
diff --git a/go.sum b/go.sum
index 7e52201..3fd30f3 100644
--- a/go.sum
+++ b/go.sum
@@ -1,10 +1,9 @@
-github.com/asaskevich/govalidator v0.0.0-20200108200545-475eaeb16496 h1:zV3ejI06GQ59hwDQAvmK1qxOQGB3WuVTRoY0okPTAv0=
-github.com/asaskevich/govalidator v0.0.0-20200108200545-475eaeb16496/go.mod h1:oGkLhpf+kjZl6xBf758TQhh5XrAeiJv/7FRz/2spLIg=
+github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d h1:Byv0BzEl3/e6D5CLfI0j/7hiIEtvGVFPCZ7Ei2oq8iQ=
+github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
diff --git a/is/rules.go b/is/rules.go
index 3cad215..ce18f40 100644
--- a/is/rules.go
+++ b/is/rules.go
@@ -58,6 +58,8 @@ var (
 	ErrUUIDv5 = validation.NewError("validation_is_uuid_v5", "must be a valid UUID v5")
 	// ErrUUID is the error that returns in case of an invalid UUID value.
 	ErrUUID = validation.NewError("validation_is_uuid", "must be a valid UUID")
+	// ErrULID is the error that returns in case of an invalid ULID value.
+	ErrULID = validation.NewError("validation_is_ulid", "must be a valid ULID")
 	// ErrCreditCard is the error that returns in case of an invalid credit card number.
 	ErrCreditCard = validation.NewError("validation_is_credit_card", "must be a valid credit card number")
 	// ErrISBN10 is the error that returns in case of an invalid ISBN-10 value.
@@ -171,6 +173,8 @@ var (
 	UUIDv5 = validation.NewStringRuleWithError(govalidator.IsUUIDv5, ErrUUIDv5)
 	// UUID validates if a string is a valid UUID
 	UUID = validation.NewStringRuleWithError(govalidator.IsUUID, ErrUUID)
+	// ULID validates if a string is a valid ULID
+	ULID = validation.NewStringRuleWithError(govalidator.IsULID, ErrULID)
 	// CreditCard validates if a string is a valid credit card number
 	CreditCard = validation.NewStringRuleWithError(govalidator.IsCreditCard, ErrCreditCard)
 	// ISBN10 validates if a string is an ISBN version 10