app/models/remote_storage_authorization.rb

@@ -30,8 +30,7 @@ class RemoteStorageAuthorization < ApplicationRecord
 
   def delete_token_from_redis
     key = "rs:authorizations:#{user.address}:#{token}"
-    # You can't delete multiple members of a set with Redis 2
-    redis.smembers(key).each { |auth| redis.srem(key, auth) }
+    redis.srem? key, redis.smembers(key)
   end
 
   private