# Jupyter Notebook hangs

**URL:** <https://discourse.julialang.org/t/jupyter-notebook-hangs/129149>\
**Category:** Jupyter-Notebook\
**Tags:** vscode\
**Created:** [May 19, 2025, 3:23pm UTC](https://discourse.julialang.org/t/jupyter-notebook-hangs/129149 "2025-05-19T15:23:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![chelseas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chelseas/32/12148_2.png) [@chelseas](https://discourse.julialang.org/u/chelseas)\
**Post date:** [May 19, 2025, 3:23pm UTC](https://discourse.julialang.org/t/jupyter-notebook-hangs/129149/1 "2025-05-19T15:23:44Z")

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I am finding that jupyter notebooks lately just hang indefinitely. A simple calculation like ‘5+2’ just hangs.  
Machine: Mac OS  
Julia: 1.11 release channel  
IJulia: 1.27.0

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**Author:** ![jling](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jling/32/212909_2.png) [@jling](https://discourse.julialang.org/u/jling)\
**Post date:** [May 19, 2025, 3:38pm UTC](https://discourse.julialang.org/t/jupyter-notebook-hangs/129149/2 "2025-05-19T15:38:13Z")

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are you sure the kernel actually launched and connected? did you recently update Julia version?

you may need to open a Julia RPEL and do:

```julia
using IJulia
IJulia.installkernel()

```

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**Author:** ![JamesNZ](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jamesnz/32/35361_2.png) [@JamesNZ](https://discourse.julialang.org/u/JamesNZ)\
**Post date:** [May 20, 2025, 9:14pm UTC](https://discourse.julialang.org/t/jupyter-notebook-hangs/129149/3 "2025-05-20T21:14:50Z")

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We’re working on some new troubleshooting docs, there might be something useful there to debug the issue: [Add kernel troubleshooting instructions by goerz · Pull Request #1156 · JuliaLang/IJulia.jl · GitHub](https://github.com/JuliaLang/IJulia.jl/pull/1156/files)