diff --git a/pkg/slice/admin_permission.go b/pkg/slice/admin_permission.go
deleted file mode 100644
index aac3d86..0000000
--- a/pkg/slice/admin_permission.go
+++ /dev/null
@@ -1,15 +0,0 @@
-package slice
-
-import (
-	"git.gocasts.ir/ebhomengo/niki/entity"
-)
-
-func DoesExist(list []entity.AdminPermission, value entity.AdminPermission) bool {
-	for _, item := range list {
-		if item == value {
-			return true
-		}
-	}
-
-	return false
-}
diff --git a/repository/mysql/admin/authorization.go b/repository/mysql/admin/authorization.go
index cf8ff8f..c4daccd 100644
--- a/repository/mysql/admin/authorization.go
+++ b/repository/mysql/admin/authorization.go
@@ -1,12 +1,12 @@
 package mysqladmin
 
 import (
+	"slices"
 	"time"
 
 	"git.gocasts.ir/ebhomengo/niki/entity"
 	errmsg "git.gocasts.ir/ebhomengo/niki/pkg/err_msg"
 	richerror "git.gocasts.ir/ebhomengo/niki/pkg/rich_error"
-	"git.gocasts.ir/ebhomengo/niki/pkg/slice"
 	"git.gocasts.ir/ebhomengo/niki/repository/mysql"
 )
 
@@ -70,12 +70,12 @@ func (d *DB) GetAdminPermissions(adminID uint, role entity.AdminRole) ([]entity.
 	// merge ACLs by permission
 	adminPermissions := make([]entity.AdminPermission, 0)
 	for _, r := range adminRoleACL {
-		if !slice.DoesExist(adminPermissions, r.Permission) {
+		if !slices.Contains(adminPermissions, r.Permission) {
 			adminPermissions = append(adminPermissions, r.Permission)
 		}
 	}
 	for _, a := range adminACL {
-		if !slice.DoesExist(adminPermissions, a.Permission) {
+		if !slices.Contains(adminPermissions, a.Permission) {
 			adminPermissions = append(adminPermissions, a.Permission)
 		}
 	}