# Zcashd issues **URL:** \ **Category:** zcashd client\ **Created:** [December 24, 2020, 3:45pm UTC](https://forum.zcashcommunity.com/t/zcashd-issues/38025 "2020-12-24T15:45:23Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![FredricRowan](https://avatars.discourse-cdn.com/v4/letter/f/c4cdca/32.png) [@FredricRowan](https://forum.zcashcommunity.com/u/FredricRowan)\ **Post date:** [December 24, 2020, 3:45pm UTC](https://forum.zcashcommunity.com/t/zcashd-issues/38025/1 "2020-12-24T15:45:23Z")
Hello, I have zcadsh 2.1.2-3, and it’s been downloading blocks for three days even though I use employee monitoring systems. Sometimes it stops by itself, and I have to rerun it. I noticed zcashd only uses 1 CPU while downloading blocks. I have 24 GB of RAM and 12 Core. How can I make zcashd to use more CPUs? p.s. i dont have very good English, sorry ---
**Author:** ![str4d](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/str4d/32/64_2.png) [@str4d](https://forum.zcashcommunity.com/u/str4d)\ **Post date:** [December 24, 2020, 4:27pm UTC](https://forum.zcashcommunity.com/t/zcashd-issues/38025/2 "2020-12-24T16:27:22Z")
You are using a very out-of-date version of `zcashd`, which will not connect correctly to the current network (it may download old blocks, but will stall when trying to download post-Heartwood blocks). You should upgrade to `zcashd v4.2.0` which was released earlier this week: [Zcash Full Node and CLI — Zcash Documentation 5.2.0 documentation](https://zcash.readthedocs.io/en/latest/rtd_pages/zcashd.html#upgrading) ---
**Author:** ![FredricRowan](https://avatars.discourse-cdn.com/v4/letter/f/c4cdca/32.png) [@FredricRowan](https://forum.zcashcommunity.com/u/FredricRowan)\ **Post date:** [December 28, 2020, 9:49am UTC](https://forum.zcashcommunity.com/t/zcashd-issues/38025/3 "2020-12-28T09:49:06Z")
thanks, I updated to the latest version and now everything works well, I hope there will be no more crashes!