diff --git a/src/services/ChallengeService.js b/src/services/ChallengeService.js
index 712df13b..47616a6d 100644
--- a/src/services/ChallengeService.js
+++ b/src/services/ChallengeService.js
@@ -2073,7 +2073,7 @@ updateChallenge.schema = {
             .unknown(true)
         )
         .min(1),
-      tags: Joi.array().items(Joi.string().required()).min(1), // tag names
+      tags: Joi.array().items(Joi.string()), // tag names
       projectId: Joi.number().integer().positive(),
       legacyId: Joi.number().integer().positive(),
       constraints: Joi.object()