diff --git a/dialect/sql/builder_test.go b/dialect/sql/builder_test.go
index e0545e852..f640fe5a0 100644
--- a/dialect/sql/builder_test.go
+++ b/dialect/sql/builder_test.go
@@ -1711,8 +1711,8 @@ func TestInsert_OnConflict(t *testing.T) {
 	t.Run("Postgres", func(t *testing.T) { // And SQLite.
 		query, args := Dialect(dialect.Postgres).
 			Insert("users").
-			Columns("id", "email").
-			Values("1", "user@example.com").
+			Columns("id", "email", "creation_time").
+			Values("1", "user@example.com", 1633279231).
 			OnConflict(
 				ConflictColumns("email"),
 				ConflictWhere(EQ("name", "Ariel")),
@@ -1720,13 +1720,14 @@ func TestInsert_OnConflict(t *testing.T) {
 				// Update all new values excepts id field.
 				ResolveWith(func(u *UpdateSet) {
 					u.SetIgnore("id")
+					u.SetIgnore("creation_time")
 					u.Add("version", 1)
 				}),
 				UpdateWhere(NEQ("updated_at", 0)),
 			).
 			Query()
-		require.Equal(t, `INSERT INTO "users" ("id", "email") VALUES ($1, $2) ON CONFLICT ("email") WHERE "name" = $3 DO UPDATE SET "id" = "users"."id", "email" = "excluded"."email", "version" = COALESCE("users"."version", 0) + $4 WHERE "updated_at" <> $5`, query)
-		require.Equal(t, []interface{}{"1", "user@example.com", "Ariel", 1, 0}, args)
+		require.Equal(t, `INSERT INTO "users" ("id", "email", "creation_time") VALUES ($1, $2, $3) ON CONFLICT ("email") WHERE "name" = $4 DO UPDATE SET "id" = "users"."id", "email" = "excluded"."email", "creation_time" = "users"."creation_time", "version" = COALESCE("users"."version", 0) + $5 WHERE "updated_at" <> $6`, query)
+		require.Equal(t, []interface{}{"1", "user@example.com", 1633279231, "Ariel", 1, 0}, args)
 
 		query, args = Dialect(dialect.Postgres).
 			Insert("users").
diff --git a/entc/gen/bench_test.go b/entc/gen/bench_test.go
index bf3cd9bce..cafd6e983 100644
--- a/entc/gen/bench_test.go
+++ b/entc/gen/bench_test.go
@@ -16,7 +16,6 @@ import (
 )
 
 func BenchmarkGraph_Gen(b *testing.B) {
-	b.ReportAllocs()
 	target := filepath.Join(os.TempDir(), "ent")
 	require.NoError(b, os.MkdirAll(target, os.ModePerm), "creating tmpdir")
 	defer os.RemoveAll(target)
diff --git a/entc/gen/template/dialect/sql/feature/upsert.tmpl b/entc/gen/template/dialect/sql/feature/upsert.tmpl
index 12bf12b3f..210ccd17e 100644
--- a/entc/gen/template/dialect/sql/feature/upsert.tmpl
+++ b/entc/gen/template/dialect/sql/feature/upsert.tmpl
@@ -143,7 +143,7 @@ type (
 {{ end }}
 
 
-// UpdateNewValues updates the fields using the new values that were set on create{{ if $.ID.UserDefined }} except the ID field{{ end }}.
+// UpdateNewValues updates the mutable fields using the new values that were set on create{{ if $.ID.UserDefined }} except the ID field{{ end }}.
 // Using this option is equivalent to using:
 //
 //	client.{{ $.Name }}.Create().
@@ -159,11 +159,18 @@ type (
 //
 func (u *{{ $upsertOne }}) UpdateNewValues() *{{ $upsertOne }} {
 	u.create.conflict = append(u.create.conflict, sql.ResolveWithNewValues())
-	{{- if $.ID.UserDefined }}
+	{{- if or $.ID.UserDefined $.ImmutableFields }}
 		u.create.conflict = append(u.create.conflict, sql.ResolveWith(func(s *sql.UpdateSet) {
-			if _, exists := u.create.mutation.ID(); exists {
-				s.SetIgnore({{ $.Package }}.{{ $.ID.Constant }})
-			}
+			{{- if $.ID.UserDefined }}
+				if _, exists := u.create.mutation.ID(); exists {
+					s.SetIgnore({{ $.Package }}.{{ $.ID.Constant }})
+				}
+			{{- end }}
+			{{- range $f := $.ImmutableFields }}
+				if _, exists := u.create.mutation.{{ $f.MutationGet }}(); exists {
+					s.SetIgnore({{ $.Package }}.{{ $f.Constant }})
+				}
+			{{- end }}
 		}))
 	{{- end }}
 	return u
@@ -306,7 +313,7 @@ type {{ $upsertBulk }} struct {
 }
 
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.{{ $.Name }}.Create().
@@ -322,13 +329,20 @@ type {{ $upsertBulk }} struct {
 //
 func (u *{{ $upsertBulk }}) UpdateNewValues() *{{ $upsertBulk }} {
 	u.create.conflict = append(u.create.conflict, sql.ResolveWithNewValues())
-	{{- if $.ID.UserDefined }}
+	{{- if or $.ID.UserDefined $.ImmutableFields }}
 		u.create.conflict = append(u.create.conflict, sql.ResolveWith(func(s *sql.UpdateSet) {
 			for _, b := range u.create.builders {
-				if _, exists := b.mutation.ID(); exists {
-					s.SetIgnore({{ $.Package }}.{{ $.ID.Constant }})
-					return
-				}
+				{{- if $.ID.UserDefined }}
+					if _, exists := b.mutation.ID(); exists {
+						s.SetIgnore({{ $.Package }}.{{ $.ID.Constant }})
+						return
+					}
+				{{- end }}
+				{{- range $f := $.ImmutableFields }}
+					if _, exists := b.mutation.{{ $f.MutationGet }}(); exists {
+						s.SetIgnore({{ $.Package }}.{{ $f.Constant }})
+					}
+				{{- end }}
 			}
 		}))
 	{{- end }}
@@ -429,4 +443,4 @@ func (u *{{ $upsertBulk }}) ExecX(ctx context.Context) {
         }
     {{ end }}
 {{ end }}
-{{ end }}
\ No newline at end of file
+{{ end }}
diff --git a/entc/gen/type.go b/entc/gen/type.go
index cd8d51493..97ca9e1d5 100644
--- a/entc/gen/type.go
+++ b/entc/gen/type.go
@@ -459,6 +459,17 @@ func (t Type) MutableFields() []*Field {
 	return fields
 }
 
+// ImmutableFields returns all type fields that are immutable (for update).
+func (t Type) ImmutableFields() []*Field {
+	fields := make([]*Field, 0, len(t.Fields))
+	for _, f := range t.Fields {
+		if f.Immutable {
+			fields = append(fields, f)
+		}
+	}
+	return fields
+}
+
 // MutationFields returns all the fields that are available on the typed-mutation.
 func (t Type) MutationFields() []*Field {
 	fields := make([]*Field, 0, len(t.Fields))
@@ -864,7 +875,7 @@ func (f Field) UpdateDefaultName() string { return "Update" + f.DefaultName() }
 func (f Field) DefaultValue() interface{} { return f.def.DefaultValue }
 
 // DefaultFunc returns a bool stating if the default value is a func. Invoked by the template.
-func (f Field) DefaultFunc() interface{} { return f.def.DefaultKind == reflect.Func }
+func (f Field) DefaultFunc() bool { return f.def.DefaultKind == reflect.Func }
 
 // BuilderField returns the struct member of the field in the builder.
 func (f Field) BuilderField() string {
diff --git a/entc/integration/customid/ent/blob_create.go b/entc/integration/customid/ent/blob_create.go
index 1cd183f65..e7d1ccfbd 100644
--- a/entc/integration/customid/ent/blob_create.go
+++ b/entc/integration/customid/ent/blob_create.go
@@ -352,7 +352,7 @@ func (u *BlobUpsert) AddCount(v int) *BlobUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.Blob.Create().
@@ -600,7 +600,7 @@ type BlobUpsertBulk struct {
 	create *BlobCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Blob.Create().
diff --git a/entc/integration/customid/ent/car_create.go b/entc/integration/customid/ent/car_create.go
index 8e3200707..0e6255ec6 100644
--- a/entc/integration/customid/ent/car_create.go
+++ b/entc/integration/customid/ent/car_create.go
@@ -365,7 +365,7 @@ func (u *CarUpsert) UpdateModel() *CarUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.Car.Create().
@@ -646,7 +646,7 @@ type CarUpsertBulk struct {
 	create *CarCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Car.Create().
diff --git a/entc/integration/customid/ent/device_create.go b/entc/integration/customid/ent/device_create.go
index 964f06965..de2cc85e8 100644
--- a/entc/integration/customid/ent/device_create.go
+++ b/entc/integration/customid/ent/device_create.go
@@ -272,7 +272,7 @@ type (
 	}
 )
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.Device.Create().
@@ -480,7 +480,7 @@ type DeviceUpsertBulk struct {
 	create *DeviceCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Device.Create().
diff --git a/entc/integration/customid/ent/doc_create.go b/entc/integration/customid/ent/doc_create.go
index 284fdc836..429523fd4 100644
--- a/entc/integration/customid/ent/doc_create.go
+++ b/entc/integration/customid/ent/doc_create.go
@@ -325,7 +325,7 @@ func (u *DocUpsert) ClearText() *DocUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.Doc.Create().
@@ -559,7 +559,7 @@ type DocUpsertBulk struct {
 	create *DocCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Doc.Create().
diff --git a/entc/integration/customid/ent/group_create.go b/entc/integration/customid/ent/group_create.go
index 767095fca..39fa4a172 100644
--- a/entc/integration/customid/ent/group_create.go
+++ b/entc/integration/customid/ent/group_create.go
@@ -218,7 +218,7 @@ type (
 	}
 )
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.Group.Create().
@@ -424,7 +424,7 @@ type GroupUpsertBulk struct {
 	create *GroupCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Group.Create().
diff --git a/entc/integration/customid/ent/mixinid_create.go b/entc/integration/customid/ent/mixinid_create.go
index 56d5d6012..6ba4117d0 100644
--- a/entc/integration/customid/ent/mixinid_create.go
+++ b/entc/integration/customid/ent/mixinid_create.go
@@ -257,7 +257,7 @@ func (u *MixinIDUpsert) UpdateMixinField() *MixinIDUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.MixinID.Create().
@@ -498,7 +498,7 @@ type MixinIDUpsertBulk struct {
 	create *MixinIDCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.MixinID.Create().
diff --git a/entc/integration/customid/ent/note_create.go b/entc/integration/customid/ent/note_create.go
index d5e09dde2..1fc2018ad 100644
--- a/entc/integration/customid/ent/note_create.go
+++ b/entc/integration/customid/ent/note_create.go
@@ -325,7 +325,7 @@ func (u *NoteUpsert) ClearText() *NoteUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.Note.Create().
@@ -559,7 +559,7 @@ type NoteUpsertBulk struct {
 	create *NoteCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Note.Create().
diff --git a/entc/integration/customid/ent/pet_create.go b/entc/integration/customid/ent/pet_create.go
index f6df07b9a..ebf9360c1 100644
--- a/entc/integration/customid/ent/pet_create.go
+++ b/entc/integration/customid/ent/pet_create.go
@@ -353,7 +353,7 @@ type (
 	}
 )
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.Pet.Create().
@@ -561,7 +561,7 @@ type PetUpsertBulk struct {
 	create *PetCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Pet.Create().
diff --git a/entc/integration/customid/ent/session_create.go b/entc/integration/customid/ent/session_create.go
index 288eb4223..063bbb19b 100644
--- a/entc/integration/customid/ent/session_create.go
+++ b/entc/integration/customid/ent/session_create.go
@@ -238,7 +238,7 @@ type (
 	}
 )
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.Session.Create().
@@ -446,7 +446,7 @@ type SessionUpsertBulk struct {
 	create *SessionCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Session.Create().
diff --git a/entc/integration/customid/ent/user_create.go b/entc/integration/customid/ent/user_create.go
index 9d1cd9127..44a65336a 100644
--- a/entc/integration/customid/ent/user_create.go
+++ b/entc/integration/customid/ent/user_create.go
@@ -326,7 +326,7 @@ type (
 	}
 )
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.User.Create().
@@ -532,7 +532,7 @@ type UserUpsertBulk struct {
 	create *UserCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.User.Create().
diff --git a/entc/integration/ent/card_create.go b/entc/integration/ent/card_create.go
index cf0ea4713..5d193bd6e 100644
--- a/entc/integration/ent/card_create.go
+++ b/entc/integration/ent/card_create.go
@@ -466,7 +466,7 @@ func (u *CardUpsert) ClearName() *CardUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.Card.Create().
@@ -477,6 +477,14 @@ func (u *CardUpsert) ClearName() *CardUpsert {
 //
 func (u *CardUpsertOne) UpdateNewValues() *CardUpsertOne {
 	u.create.conflict = append(u.create.conflict, sql.ResolveWithNewValues())
+	u.create.conflict = append(u.create.conflict, sql.ResolveWith(func(s *sql.UpdateSet) {
+		if _, exists := u.create.mutation.CreateTime(); exists {
+			s.SetIgnore(card.FieldCreateTime)
+		}
+		if _, exists := u.create.mutation.Number(); exists {
+			s.SetIgnore(card.FieldNumber)
+		}
+	}))
 	return u
 }
 
@@ -754,7 +762,7 @@ type CardUpsertBulk struct {
 	create *CardCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Card.Create().
@@ -765,6 +773,16 @@ type CardUpsertBulk struct {
 //
 func (u *CardUpsertBulk) UpdateNewValues() *CardUpsertBulk {
 	u.create.conflict = append(u.create.conflict, sql.ResolveWithNewValues())
+	u.create.conflict = append(u.create.conflict, sql.ResolveWith(func(s *sql.UpdateSet) {
+		for _, b := range u.create.builders {
+			if _, exists := b.mutation.CreateTime(); exists {
+				s.SetIgnore(card.FieldCreateTime)
+			}
+			if _, exists := b.mutation.Number(); exists {
+				s.SetIgnore(card.FieldNumber)
+			}
+		}
+	}))
 	return u
 }
 
diff --git a/entc/integration/ent/card_update.go b/entc/integration/ent/card_update.go
index 6045e00d6..27c28a9ae 100644
--- a/entc/integration/ent/card_update.go
+++ b/entc/integration/ent/card_update.go
@@ -10,6 +10,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"time"
 
 	"entgo.io/ent/dialect/sql"
 	"entgo.io/ent/dialect/sql/sqlgraph"
@@ -33,6 +34,12 @@ func (cu *CardUpdate) Where(ps ...predicate.Card) *CardUpdate {
 	return cu
 }
 
+// SetUpdateTime sets the "update_time" field.
+func (cu *CardUpdate) SetUpdateTime(t time.Time) *CardUpdate {
+	cu.mutation.SetUpdateTime(t)
+	return cu
+}
+
 // SetBalance sets the "balance" field.
 func (cu *CardUpdate) SetBalance(f float64) *CardUpdate {
 	cu.mutation.ResetBalance()
@@ -379,6 +386,12 @@ type CardUpdateOne struct {
 	mutation *CardMutation
 }
 
+// SetUpdateTime sets the "update_time" field.
+func (cuo *CardUpdateOne) SetUpdateTime(t time.Time) *CardUpdateOne {
+	cuo.mutation.SetUpdateTime(t)
+	return cuo
+}
+
 // SetBalance sets the "balance" field.
 func (cuo *CardUpdateOne) SetBalance(f float64) *CardUpdateOne {
 	cuo.mutation.ResetBalance()
diff --git a/entc/integration/ent/comment_create.go b/entc/integration/ent/comment_create.go
index 39ddcadde..b4cb9b907 100644
--- a/entc/integration/ent/comment_create.go
+++ b/entc/integration/ent/comment_create.go
@@ -293,7 +293,7 @@ func (u *CommentUpsert) ClearNillableInt() *CommentUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.Comment.Create().
@@ -566,7 +566,7 @@ type CommentUpsertBulk struct {
 	create *CommentCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Comment.Create().
diff --git a/entc/integration/ent/fieldtype_create.go b/entc/integration/ent/fieldtype_create.go
index d32314658..02f271c34 100644
--- a/entc/integration/ent/fieldtype_create.go
+++ b/entc/integration/ent/fieldtype_create.go
@@ -2781,7 +2781,7 @@ func (u *FieldTypeUpsert) ClearPasswordOther() *FieldTypeUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.FieldType.Create().
@@ -4455,7 +4455,7 @@ type FieldTypeUpsertBulk struct {
 	create *FieldTypeCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.FieldType.Create().
diff --git a/entc/integration/ent/file_create.go b/entc/integration/ent/file_create.go
index 459e848e7..a500a928f 100644
--- a/entc/integration/ent/file_create.go
+++ b/entc/integration/ent/file_create.go
@@ -498,7 +498,7 @@ func (u *FileUpsert) ClearOp() *FileUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.File.Create().
@@ -800,7 +800,7 @@ type FileUpsertBulk struct {
 	create *FileCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.File.Create().
diff --git a/entc/integration/ent/filetype_create.go b/entc/integration/ent/filetype_create.go
index 5fee89ecd..3b3f1a8b4 100644
--- a/entc/integration/ent/filetype_create.go
+++ b/entc/integration/ent/filetype_create.go
@@ -338,7 +338,7 @@ func (u *FileTypeUpsert) UpdateState() *FileTypeUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.FileType.Create().
@@ -584,7 +584,7 @@ type FileTypeUpsertBulk struct {
 	create *FileTypeCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.FileType.Create().
diff --git a/entc/integration/ent/goods_create.go b/entc/integration/ent/goods_create.go
index 34c3e67f6..d8945b849 100644
--- a/entc/integration/ent/goods_create.go
+++ b/entc/integration/ent/goods_create.go
@@ -171,7 +171,7 @@ type (
 	}
 )
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.Goods.Create().
@@ -369,7 +369,7 @@ type GoodsUpsertBulk struct {
 	create *GoodsCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Goods.Create().
diff --git a/entc/integration/ent/group_create.go b/entc/integration/ent/group_create.go
index a160b8649..b295a3771 100644
--- a/entc/integration/ent/group_create.go
+++ b/entc/integration/ent/group_create.go
@@ -526,7 +526,7 @@ func (u *GroupUpsert) UpdateName() *GroupUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.Group.Create().
@@ -821,7 +821,7 @@ type GroupUpsertBulk struct {
 	create *GroupCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Group.Create().
diff --git a/entc/integration/ent/groupinfo_create.go b/entc/integration/ent/groupinfo_create.go
index 57f52740a..ba5a43530 100644
--- a/entc/integration/ent/groupinfo_create.go
+++ b/entc/integration/ent/groupinfo_create.go
@@ -293,7 +293,7 @@ func (u *GroupInfoUpsert) AddMaxUsers(v int) *GroupInfoUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.GroupInfo.Create().
@@ -532,7 +532,7 @@ type GroupInfoUpsertBulk struct {
 	create *GroupInfoCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.GroupInfo.Create().
diff --git a/entc/integration/ent/item_create.go b/entc/integration/ent/item_create.go
index a4c777732..c5c23be3a 100644
--- a/entc/integration/ent/item_create.go
+++ b/entc/integration/ent/item_create.go
@@ -256,7 +256,7 @@ func (u *ItemUpsert) ClearText() *ItemUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create except the ID field.
+// UpdateNewValues updates the mutable fields using the new values that were set on create except the ID field.
 // Using this option is equivalent to using:
 //
 //	client.Item.Create().
@@ -490,7 +490,7 @@ type ItemUpsertBulk struct {
 	create *ItemCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Item.Create().
diff --git a/entc/integration/ent/migrate/schema.go b/entc/integration/ent/migrate/schema.go
index 68198cbb0..863b0fc18 100644
--- a/entc/integration/ent/migrate/schema.go
+++ b/entc/integration/ent/migrate/schema.go
@@ -44,7 +44,7 @@ var (
 			},
 			{
 				Name:    "card_number",
-				Unique:  false,
+				Unique:  true,
 				Columns: []*schema.Column{CardsColumns[4]},
 			},
 			{
diff --git a/entc/integration/ent/node_create.go b/entc/integration/ent/node_create.go
index 2f7a074e6..823d99d7f 100644
--- a/entc/integration/ent/node_create.go
+++ b/entc/integration/ent/node_create.go
@@ -300,7 +300,7 @@ func (u *NodeUpsert) ClearValue() *NodeUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.Node.Create().
@@ -531,7 +531,7 @@ type NodeUpsertBulk struct {
 	create *NodeCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Node.Create().
diff --git a/entc/integration/ent/pet_create.go b/entc/integration/ent/pet_create.go
index c5869fd7f..986ae236d 100644
--- a/entc/integration/ent/pet_create.go
+++ b/entc/integration/ent/pet_create.go
@@ -410,7 +410,7 @@ func (u *PetUpsert) ClearNickname() *PetUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.Pet.Create().
@@ -691,7 +691,7 @@ type PetUpsertBulk struct {
 	create *PetCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Pet.Create().
diff --git a/entc/integration/ent/schema/card.go b/entc/integration/ent/schema/card.go
index 7228a05b6..3952aaeea 100644
--- a/entc/integration/ent/schema/card.go
+++ b/entc/integration/ent/schema/card.go
@@ -94,7 +94,8 @@ func (Card) Edges() []ent.Edge {
 func (Card) Indexes() []ent.Index {
 	return []ent.Index{
 		index.Fields("id"),
-		index.Fields("number"),
+		index.Fields("number").
+			Unique(),
 		index.Fields("id", "name", "number"),
 	}
 }
diff --git a/entc/integration/ent/spec_create.go b/entc/integration/ent/spec_create.go
index 032d9b693..cecc5dc8d 100644
--- a/entc/integration/ent/spec_create.go
+++ b/entc/integration/ent/spec_create.go
@@ -206,7 +206,7 @@ type (
 	}
 )
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.Spec.Create().
@@ -404,7 +404,7 @@ type SpecUpsertBulk struct {
 	create *SpecCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Spec.Create().
diff --git a/entc/integration/ent/task_create.go b/entc/integration/ent/task_create.go
index c4d9a2b23..80aa322b2 100644
--- a/entc/integration/ent/task_create.go
+++ b/entc/integration/ent/task_create.go
@@ -235,7 +235,7 @@ func (u *TaskUpsert) AddPriority(v schema.Priority) *TaskUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.Task.Create().
@@ -460,7 +460,7 @@ type TaskUpsertBulk struct {
 	create *TaskCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.Task.Create().
diff --git a/entc/integration/ent/user_create.go b/entc/integration/ent/user_create.go
index 195af5e68..4d6d472fb 100644
--- a/entc/integration/ent/user_create.go
+++ b/entc/integration/ent/user_create.go
@@ -1030,7 +1030,7 @@ func (u *UserUpsert) ClearSSOCert() *UserUpsert {
 	return u
 }
 
-// UpdateNewValues updates the fields using the new values that were set on create.
+// UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
 //	client.User.Create().
@@ -1444,7 +1444,7 @@ type UserUpsertBulk struct {
 	create *UserCreateBulk
 }
 
-// UpdateNewValues updates the fields using the new values that
+// UpdateNewValues updates the mutable fields using the new values that
 // were set on create. Using this option is equivalent to using:
 //
 //	client.User.Create().
diff --git a/entc/integration/gremlin/ent/card_update.go b/entc/integration/gremlin/ent/card_update.go
index bac38b81b..08e0b622b 100644
--- a/entc/integration/gremlin/ent/card_update.go
+++ b/entc/integration/gremlin/ent/card_update.go
@@ -10,6 +10,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"time"
 
 	"entgo.io/ent/dialect/gremlin"
 	"entgo.io/ent/dialect/gremlin/graph/dsl"
@@ -35,6 +36,12 @@ func (cu *CardUpdate) Where(ps ...predicate.Card) *CardUpdate {
 	return cu
 }
 
+// SetUpdateTime sets the "update_time" field.
+func (cu *CardUpdate) SetUpdateTime(t time.Time) *CardUpdate {
+	cu.mutation.SetUpdateTime(t)
+	return cu
+}
+
 // SetBalance sets the "balance" field.
 func (cu *CardUpdate) SetBalance(f float64) *CardUpdate {
 	cu.mutation.ResetBalance()
@@ -309,6 +316,12 @@ type CardUpdateOne struct {
 	mutation *CardMutation
 }
 
+// SetUpdateTime sets the "update_time" field.
+func (cuo *CardUpdateOne) SetUpdateTime(t time.Time) *CardUpdateOne {
+	cuo.mutation.SetUpdateTime(t)
+	return cuo
+}
+
 // SetBalance sets the "balance" field.
 func (cuo *CardUpdateOne) SetBalance(f float64) *CardUpdateOne {
 	cuo.mutation.ResetBalance()
diff --git a/entc/integration/integration_test.go b/entc/integration/integration_test.go
index 4c0c51106..3a0b3ec18 100644
--- a/entc/integration/integration_test.go
+++ b/entc/integration/integration_test.go
@@ -23,6 +23,7 @@ import (
 	"entgo.io/ent/dialect/sql"
 	"entgo.io/ent/dialect/sql/sqlgraph"
 	"entgo.io/ent/entc/integration/ent"
+	"entgo.io/ent/entc/integration/ent/card"
 	"entgo.io/ent/entc/integration/ent/enttest"
 	"entgo.io/ent/entc/integration/ent/file"
 	"entgo.io/ent/entc/integration/ent/filetype"
@@ -367,6 +368,20 @@ func Upsert(t *testing.T, client *ent.Client) {
 			ExecX(ctx)
 		require.Equal(t, bid, client.Item.Query().OnlyIDX(ctx))
 	}
+
+	c1 := client.Card.Create().
+		SetNumber("102030").
+		SetCreateTime(time.Unix(1623279251, 0)).
+		SetUpdateTime(time.Unix(1623279251, 0)).
+		SaveX(ctx)
+	id = client.Card.Create().
+		SetNumber(c1.Number).
+		OnConflictColumns(card.FieldNumber).
+		UpdateNewValues().
+		IDX(ctx)
+	c2 := client.Card.GetX(ctx, id)
+	require.Equal(t, c1.CreateTime.Unix(), c2.CreateTime.Unix())
+	require.NotEqual(t, c1.UpdateTime.Unix(), c2.UpdateTime.Unix())
 }
 
 func Clone(t *testing.T, client *ent.Client) {
diff --git a/schema/field/field.go b/schema/field/field.go
index 113613b31..f61ab140e 100644
--- a/schema/field/field.go
+++ b/schema/field/field.go
@@ -345,7 +345,8 @@ func (b *timeBuilder) Optional() *timeBuilder {
 	return b
 }
 
-// Immutable indicates that this field cannot be updated.
+// Immutable fields are fields that can be set only in the creation of the entity.
+// i.e., no setters will be generated for the entity updaters (one and many).
 func (b *timeBuilder) Immutable() *timeBuilder {
 	b.desc.Immutable = true
 	return b
diff --git a/schema/mixin/mixin.go b/schema/mixin/mixin.go
index 42535f58e..f9c5fa150 100644
--- a/schema/mixin/mixin.go
+++ b/schema/mixin/mixin.go
@@ -65,8 +65,7 @@ func (UpdateTime) Fields() []ent.Field {
 	return []ent.Field{
 		field.Time("update_time").
 			Default(time.Now).
-			UpdateDefault(time.Now).
-			Immutable(),
+			UpdateDefault(time.Now),
 	}
 }
 
diff --git a/schema/mixin/mixin_test.go b/schema/mixin/mixin_test.go
index 5b1722afb..59ab6d60a 100644
--- a/schema/mixin/mixin_test.go
+++ b/schema/mixin/mixin_test.go
@@ -33,7 +33,6 @@ func TestTimeMixin(t *testing.T) {
 		require.Len(t, fields, 1)
 		desc := fields[0].Descriptor()
 		assert.Equal(t, "update_time", desc.Name)
-		assert.True(t, desc.Immutable)
 		assert.NotNil(t, desc.Default)
 		assert.NotNil(t, desc.UpdateDefault)
 	})