# Issues with Reactant unable to find GPU on Colab, but CUDA.jl can

**URL:** <https://discourse.julialang.org/t/issues-with-reactant-unable-to-find-gpu-on-colab-but-cuda-jl-can/129360>\
**Category:** General Usage\
**Tags:** colab, reactant\
**Created:** [May 26, 2025, 9:49pm UTC](https://discourse.julialang.org/t/issues-with-reactant-unable-to-find-gpu-on-colab-but-cuda-jl-can/129360 "2025-05-26T21:49:35Z")\
**Posts on this page:** 1\
**Showing post:** 6

<div class="post-metadata">

**Author:** ![giordano](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/giordano/32/2166_2.png) [@giordano](https://discourse.julialang.org/u/giordano)\
**Post date:** [May 27, 2025, 9:50am UTC](https://discourse.julialang.org/t/issues-with-reactant-unable-to-find-gpu-on-colab-but-cuda-jl-can/129360/6 "2025-05-27T09:50:42Z")

</div>

Ok, I just tested in Colab myself. You need to restart the session after that, and then it should work.

My understanding is that Reactant comes preinstalled in the default environment, but they built it with a non-GPU runtime (either CPU-only, or CPU+TPU), so the default precompiled pkgimage is without GPU support, you need to force `Reactant_jll` to be re-precompiled.

---

_[View the full topic](https://discourse.julialang.org/t/issues-with-reactant-unable-to-find-gpu-on-colab-but-cuda-jl-can/129360)._