# Moc version does not meet the requirements of core@2.0.0 (Required: \>= 1.0.0)

**URL:** <https://forum.dfinity.org/t/moc-version-does-not-meet-the-requirements-of-core-2-0-0-required-1-0-0/62044>\
**Category:** Developers\
**Created:** [December 31, 2025, 2:17am UTC](https://forum.dfinity.org/t/moc-version-does-not-meet-the-requirements-of-core-2-0-0-required-1-0-0/62044 "2025-12-31T02:17:25Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![kayicp](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/kayicp/32/36679_2.png) [@kayicp](https://forum.dfinity.org/u/kayicp)\
**Post date:** [December 31, 2025, 2:17am UTC](https://forum.dfinity.org/t/moc-version-does-not-meet-the-requirements-of-core-2-0-0-required-1-0-0/62044/1 "2025-12-31T02:17:25Z")

</div>

```auto
mops add core
moc version does not meet the requirements of core@2.0.0
Required: >= 1.0.0
Installed: 0.16.2

```

happened after i upgrade my dfx to v0.30.1  
should i go back to previous version?

---

<div class="post-metadata">

**Author:** ![timo](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/timo/32/5543_2.png) [@timo](https://forum.dfinity.org/u/timo)\
**Post date:** [December 31, 2025, 5:46pm UTC](https://forum.dfinity.org/t/moc-version-does-not-meet-the-requirements-of-core-2-0-0-required-1-0-0/62044/2 "2025-12-31T17:46:25Z")

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Are you using a `mops.toml` file? Using mops should fix this.

If you have this in your `dfx.json`

```auto
  "defaults": {
    "build": {
      "packtool": "mops sources"
    }
  },

```

and this in your `mops.toml`

```auto
[dependencies]
core = "2.0.0"

[toolchain]
moc = "1.0.0"

```

then it should work regardless of what `moc` version `dfx` bundles with.

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<div class="post-metadata">

**Author:** ![kayicp](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/kayicp/32/36679_2.png) [@kayicp](https://forum.dfinity.org/u/kayicp)\
**Post date:** [December 31, 2025, 6:17pm UTC](https://forum.dfinity.org/t/moc-version-does-not-meet-the-requirements-of-core-2-0-0-required-1-0-0/62044/3 "2025-12-31T18:17:12Z")

</div>

ok I’ll try this when i get home. thanks for your time, timo