Julia kernel doesn't load in Jupyter Notebook - First installation

New to Julia
1

Hello everyone, I’m having issues trying to install Julia and IJulia for the first time.

I wish to use a workshop on Jupyter notebooks, I have installed Julia, added IJulia, and changed my Jupyter environment path to the one I use in my previous Anaconda installation.

I have been running
using IJulia
notebook(dir=raw"C ....", verbose=true)
so that it shows me the link to open up Jupyter on my browser. And when I open a notebook, it tries to connect to a Julia kernel. But that fails at almost the first step, here’s my terminal

image_2026-08-06_150250522
image_2026-08-06_1502505221696×538 29.4 KB

It tries again a few times but that never works until it basically says it stops trying.

I have tried to run Pkg.activate(“@v1.12”), Pkg.resolve(), Pkg.instantiate(), Pkg.update(), but those do either nothing or telling that no packages were added or removed.

I can provide more logs or info if needed, thank you for helping me !

2

I think you somehow still have an old version of IJulia installed, it hasn’t depended on mbedtls for over a year: Changelog · IJulia

Could an old version be installed in one of your notebook projects?

3

That might be the case, I’m using a workshop that was updated in 2022, but I think it might date from pre-2020.
Can I update each notebook one by one maybe?

4

Yeah, IJulia by default will launch itself with the --project flag, which means that it will activate the current/closest environment in the directory tree. So if you’ve instantiated an older environment for the workshop that contains IJulia, IJulia will be used from that environment rather than the version in your global environment. If that’s the case then your options are to either delete IJulia from the workshop environment or keep it and update the environment before starting the notebook.

5

How do I do both these options? Thanks for answering me btw, and sorry for asking for so much

6

Perhaps let’s back up for one second. How did you install Julia?

7

I installed Julia with the MSIX installer, and IJulia following the IJulia github page. I was already used to using Jupyter (installed the usual way with Anaconda). I didn’t create a new Jupyter thanks to Miniconda but changed my ENV[“JUPYTER”] to link it to my existing installation.

8

After you changed ENV["JUPYTER"] did you run Pkg.build()?

Could you print out the results of the following?

using Pkg
Pkg.status()
Pkg.status(mode=PKGMODE_MANIFEST)
using InteractiveUtils
versioninfo()

Mine looks as follows:

julia> using Pkg

julia> Pkg.status()
Status `~/Documents/src/ijulia_test/Project.toml`
  [7073ff75] IJulia v1.34.4

julia> Pkg.status(mode=PKGMODE_MANIFEST)
Status `~/Documents/src/ijulia_test/Manifest.toml`
  [8f4d0f93] Conda v1.10.3
  [7073ff75] IJulia v1.34.4
  [692b3bcd] JLLWrappers v1.8.0
  [682c06a0] JSON v1.7.0
  [69de0a69] Parsers v2.8.7
  [aea7be01] PrecompileTools v1.3.4
  [21216c6a] Preferences v1.5.2
  [ec057cc2] StructUtils v2.8.3
  [81def892] VersionParsing v1.3.0
  [c2297ded] ZMQ v1.5.1
  [8f1865be] ZeroMQ_jll v4.3.6+0
  [a9144af2] libsodium_jll v1.0.21+0
  [0dad84c5] ArgTools v1.1.2
  [56f22d72] Artifacts v1.11.0
  [2a0f44e3] Base64 v1.11.0
  [ade2ca70] Dates v1.11.0
  [f43a241f] Downloads v1.7.0
  [7b1f6079] FileWatching v1.11.0
  [b77e0a4c] InteractiveUtils v1.11.0
  [ac6e5ff7] JuliaSyntaxHighlighting v1.12.0
  [b27032c2] LibCURL v0.6.4
  [76f85450] LibGit2 v1.11.0
  [8f399da3] Libdl v1.11.0
  [56ddb016] Logging v1.11.0
  [d6f4376e] Markdown v1.11.0
  [ca575930] NetworkOptions v1.3.0
  [44cfe95a] Pkg v1.12.1
  [de0858da] Printf v1.11.0
  [3fa0cd96] REPL v1.11.0
  [9a3f8284] Random v1.11.0
  [ea8e919c] SHA v0.7.0
  [6462fe0b] Sockets v1.11.0
  [f489334b] StyledStrings v1.11.0
  [fa267f1f] TOML v1.0.3
  [a4e569a6] Tar v1.10.0
  [cf7118a7] UUIDs v1.11.0
  [4ec0a83e] Unicode v1.11.0
  [e66e0078] CompilerSupportLibraries_jll v1.3.0+1
  [deac9b47] LibCURL_jll v8.15.0+0
  [e37daf67] LibGit2_jll v1.9.0+0
  [29816b5a] LibSSH2_jll v1.11.3+1
  [14a3606d] MozillaCACerts_jll v2025.11.4
  [458c3c95] OpenSSL_jll v3.5.4+0
  [83775a58] Zlib_jll v1.3.1+2
  [8e850ede] nghttp2_jll v1.64.0+1
  [3f19e933] p7zip_jll v17.7.0+0

julia> versioninfo()
Julia Version 1.12.6
Commit 15346901f00 (2026-04-09 19:20 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  CPU: 10 × Apple M1 Max
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, apple-m1)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)

As noted above, I think you are trying to use an old project with a new Julia. Julia moved away from using mbedtls some time ago. What I’m trying to figure out is why running update is not retrieving a new version of IJulia.

What you might want to do is create a new directory and start a new environment with just IJulia just to see if that works.

If using powershell:

mkdir ijulia_test
julia --project=ijulia_test -e 'using Pkg; Pkg.add("IJulia")'
julia --project=ijulia_test -e "using IJulia; IJulia.notebook()"

If using cmd.exe:

mkdir ijulia_test
julia --project=ijulia_test -e "using Pkg; Pkg.add(\"IJulia\")"
julia --project=ijulia_test -e "using IJulia; IJulia.notebook()"

Alternatively, could you point us to the workshop you are trying to use?

9

Here is the (much bigger) result


julia> Pkg.status()
Status `C:\Users\Théo\.julia\environments\v1.12\Project.toml`
  [7073ff75] IJulia v1.34.4
  [739be429] MbedTLS v1.1.10
  [91a5bcdd] Plots v1.41.6
  [2b716af1] WorkshopWizard v0.1.0 `https://github.com/carstenbauer/WorkshopWizard.jl/#master`
  [c8ffd9c3] MbedTLS_jll v2.28.1010+0
  [37e2e46d] LinearAlgebra v1.12.0

julia> Pkg.status(mode=PKGMODE_MANIFEST)
Status `C:\Users\Théo\.julia\environments\v1.12\Manifest.toml`
  [66dad0bd] AliasTables v1.1.3
  [d1d4a3ce] BitFlags v0.1.10
  [944b1d66] CodecZlib v0.7.8
  [35d6a980] ColorSchemes v3.31.0
  [3da002f7] ColorTypes v0.12.1
  [c3611d14] ColorVectorSpace v0.11.0
  [5ae59095] Colors v0.13.1
  [f0e56b4a] ConcurrentUtilities v2.6.0
  [8f4d0f93] Conda v1.10.3
  [d38c429a] Contour v0.6.3
  [9a962f9c] DataAPI v1.16.0
  [864edb3b] DataStructures v0.19.6
  [8bb1440f] DelimitedFiles v1.9.1
  [ffbed154] DocStringExtensions v0.9.5
  [460bff9d] ExceptionUnwrapping v0.1.11
  [c87230d0] FFMPEG v0.4.5
⌅ [53c48c17] FixedPointNumbers v0.8.6
  [1fa38f19] Format v1.3.7
  [28b8d3ca] GR v0.73.26
  [42e2da0e] Grisu v1.0.2
⌅ [cd3eb016] HTTP v1.11.0
  [7073ff75] IJulia v1.34.4
  [92d709cd] IrrationalConstants v0.2.6
  [1019f520] JLFzf v0.1.11
  [692b3bcd] JLLWrappers v1.8.0
  [682c06a0] JSON v1.7.0
  [b964fa9f] LaTeXStrings v1.4.0
  [23fbe1c1] Latexify v0.16.11
  [2ab3a3ac] LogExpFunctions v1.0.1
  [e6f89c97] LoggingExtras v1.2.0
  [1914dd2f] MacroTools v0.5.16
  [739be429] MbedTLS v1.1.10
  [442fdcdd] Measures v0.3.3
  [e1d29d7a] Missings v1.2.0
  [77ba4419] NaNMath v1.1.4
  [4d8831e6] OpenSSL v1.6.1
⌅ [bac558e1] OrderedCollections v1.8.2
  [69de0a69] Parsers v2.8.7
  [ccf2f8ad] PlotThemes v3.3.0
  [995b91a9] PlotUtils v1.4.4
  [91a5bcdd] Plots v1.41.6
  [aea7be01] PrecompileTools v1.3.4
  [21216c6a] Preferences v1.5.2
  [43287f4e] PtrArrays v1.4.0
  [3cdcf5f2] RecipesBase v1.3.4
  [01d81517] RecipesPipeline v0.6.12
  [189a3867] Reexport v1.2.2
  [05181044] RelocatableFolders v1.0.1
  [ae029012] Requires v1.3.1
  [6c6a2e73] Scratch v1.3.0
  [992d4aef] Showoff v1.0.3
  [777ac1f9] SimpleBufferStream v1.2.0
  [a2af1166] SortingAlgorithms v1.2.3
  [860ef19b] StableRNGs v1.0.4
  [10745b16] Statistics v1.11.1
  [82ae8749] StatsAPI v1.8.0
  [2913bbd2] StatsBase v0.34.12
  [ec057cc2] StructUtils v2.8.3
  [62fd8b95] TensorCore v0.1.1
  [3bb67fe8] TranscodingStreams v0.11.3
  [5c2747f8] URIs v1.6.2
  [1cfade01] UnicodeFun v0.4.1
  [41fe7b60] Unzip v0.2.0
  [81def892] VersionParsing v1.3.0
  [2b716af1] WorkshopWizard v0.1.0 `https://github.com/carstenbauer/WorkshopWizard.jl/#master`
  [c2297ded] ZMQ v1.5.1
  [6e34b625] Bzip2_jll v1.0.9+0
  [83423d85] Cairo_jll v1.18.7+0
  [ee1fde0b] Dbus_jll v1.16.2+0
  [2702e6a9] EpollShim_jll v0.0.20230411+1
  [2e619515] Expat_jll v2.8.2+0
⌅ [b22a6f82] FFMPEG_jll v8.1.2+0
  [a3f928ae] Fontconfig_jll v2.17.1+0
  [d7e528f0] FreeType2_jll v2.14.3+1
  [559328eb] FriBidi_jll v1.0.17+0
  [0656b61e] GLFW_jll v3.4.1+1
  [d2c73de3] GR_jll v0.73.26+0
⌅ [b0724c58] GettextRuntime_jll v0.22.4+0
  [61579ee1] Ghostscript_jll v9.55.1+0
  [7746bdde] Glib_jll v2.88.3+0
  [3b182d85] Graphite2_jll v1.3.16+0
⌅ [2e76f6c2] HarfBuzz_jll v8.5.1+0
  [aacddb02] JpegTurbo_jll v3.2.0+0
  [c1c5ebd0] LAME_jll v3.100.3+0
  [88015f11] LERC_jll v4.1.0+0
  [1d63c593] LLVMOpenMP_jll v22.1.7+0
⌅ [e9f186c6] Libffi_jll v3.4.7+0
  [7e76a0d4] Libglvnd_jll v1.7.1+1
  [94ce4f54] Libiconv_jll v1.18.0+0
  [4b2f31a3] Libmount_jll v2.42.0+0
  [89763e89] Libtiff_jll v4.7.3+0
  [38a345b3] Libuuid_jll v2.42.0+0
  [c8ffd9c3] MbedTLS_jll v2.28.1010+0
  [e7412a2a] Ogg_jll v1.3.6+0
  [91d4177d] Opus_jll v1.6.1+0
  [36c8627f] Pango_jll v1.58.0+0
  [30392449] Pixman_jll v0.46.4+0
  [c0090381] Qt6Base_jll v6.10.2+2
  [629bc702] Qt6Declarative_jll v6.10.2+2
  [ce943373] Qt6ShaderTools_jll v6.10.2+1
  [6de9746b] Qt6Svg_jll v6.10.2+0
  [e99dba38] Qt6Wayland_jll v6.10.2+1
  [a44049a8] Vulkan_Loader_jll v1.3.243+0
  [a2964d1f] Wayland_jll v1.24.0+0
  [ffd25f8a] XZ_jll v5.8.3+0
  [f67eecfb] Xorg_libICE_jll v1.1.2+0
  [c834827a] Xorg_libSM_jll v1.2.6+0
  [4f6342f7] Xorg_libX11_jll v1.8.13+0
  [0c0b7dd1] Xorg_libXau_jll v1.0.13+0
  [935fb764] Xorg_libXcursor_jll v1.2.4+0
  [a3789734] Xorg_libXdmcp_jll v1.1.6+0
  [1082639a] Xorg_libXext_jll v1.3.8+0
  [d091e8ba] Xorg_libXfixes_jll v6.0.2+0
  [a51aa0fd] Xorg_libXi_jll v1.8.4+0
  [d1454406] Xorg_libXinerama_jll v1.1.7+0
  [ec84b674] Xorg_libXrandr_jll v1.5.6+0
  [ea2f1a96] Xorg_libXrender_jll v0.9.12+0
  [a65dc6b1] Xorg_libpciaccess_jll v0.19.0+0
  [c7cfdc94] Xorg_libxcb_jll v1.17.1+0
  [cc61e674] Xorg_libxkbfile_jll v1.2.0+0
  [e920d4aa] Xorg_xcb_util_cursor_jll v0.1.6+0
  [12413925] Xorg_xcb_util_image_jll v0.4.1+0
  [2def613f] Xorg_xcb_util_jll v0.4.1+0
  [975044d2] Xorg_xcb_util_keysyms_jll v0.4.1+0
  [0d47668e] Xorg_xcb_util_renderutil_jll v0.3.10+0
  [c22f9ab0] Xorg_xcb_util_wm_jll v0.4.2+0
  [35661453] Xorg_xkbcomp_jll v1.4.7+0
  [33bec58e] Xorg_xkeyboard_config_jll v2.47.0+2
  [c5fb5394] Xorg_xtrans_jll v1.6.0+0
  [8f1865be] ZeroMQ_jll v4.3.6+0
  [3161d3a3] Zstd_jll v1.5.7+1
  [35ca27e7] eudev_jll v3.2.14+0
  [214eeab7] fzf_jll v0.61.1+0
  [a4ae2306] libaom_jll v3.13.3+0
  [0ac62f75] libass_jll v0.17.4+0
  [1183f4f0] libdecor_jll v0.2.2+0
  [8e53e030] libdrm_jll v2.4.134+0
  [2db6ffa8] libevdev_jll v1.13.4+0
  [f638f0a6] libfdk_aac_jll v2.0.4+0
  [36db933b] libinput_jll v1.28.1+0
  [b53b4c65] libpng_jll v1.6.58+0
  [a9144af2] libsodium_jll v1.0.21+0
  [9a156e7d] libva_jll v2.23.0+0
  [f27f6e37] libvorbis_jll v1.3.8+0
  [009596ad] mtdev_jll v1.1.7+0
⌅ [1270edf5] x264_jll v10164.0.1+0
  [dfaa095f] x265_jll v4.1.0+0
  [d8fb68d0] xkbcommon_jll v1.13.0+0
  [0dad84c5] ArgTools v1.1.2
  [56f22d72] Artifacts v1.11.0
  [2a0f44e3] Base64 v1.11.0
  [ade2ca70] Dates v1.11.0
  [f43a241f] Downloads v1.7.0
  [7b1f6079] FileWatching v1.11.0
  [b77e0a4c] InteractiveUtils v1.11.0
  [ac6e5ff7] JuliaSyntaxHighlighting v1.12.0
  [b27032c2] LibCURL v0.6.4
  [76f85450] LibGit2 v1.11.0
  [8f399da3] Libdl v1.11.0
  [37e2e46d] LinearAlgebra v1.12.0
  [56ddb016] Logging v1.11.0
  [d6f4376e] Markdown v1.11.0
  [a63ad114] Mmap v1.11.0
  [ca575930] NetworkOptions v1.3.0
  [44cfe95a] Pkg v1.12.1
  [de0858da] Printf v1.11.0
  [3fa0cd96] REPL v1.11.0
  [9a3f8284] Random v1.11.0
  [ea8e919c] SHA v0.7.0
  [9e88b42a] Serialization v1.11.0
  [6462fe0b] Sockets v1.11.0
  [2f01184e] SparseArrays v1.12.0
  [f489334b] StyledStrings v1.11.0
  [fa267f1f] TOML v1.0.3
  [a4e569a6] Tar v1.10.0
  [8dfed614] Test v1.11.0
  [cf7118a7] UUIDs v1.11.0
  [4ec0a83e] Unicode v1.11.0
  [e66e0078] CompilerSupportLibraries_jll v1.3.0+1
  [deac9b47] LibCURL_jll v8.15.0+0
  [e37daf67] LibGit2_jll v1.9.0+0
  [29816b5a] LibSSH2_jll v1.11.3+1
  [14a3606d] MozillaCACerts_jll v2025.11.4
  [4536629a] OpenBLAS_jll v0.3.29+0
  [05823500] OpenLibm_jll v0.8.7+0
  [458c3c95] OpenSSL_jll v3.5.4+0
  [efcefdf7] PCRE2_jll v10.44.0+1
  [bea87d4a] SuiteSparse_jll v7.8.3+2
  [83775a58] Zlib_jll v1.3.1+2
  [8e850b90] libblastrampoline_jll v5.15.0+0
  [8e850ede] nghttp2_jll v1.64.0+1
  [3f19e933] p7zip_jll v17.7.0+0
Info Packages marked with ⌅ have new versions available but compatibility constraints restrict them from upgrading. To see why use `status --outdated -m`

julia> using InteractiveUtils

julia> versioninfo()
Julia Version 1.12.6
Commit 15346901f0 (2026-04-09 19:20 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 16 × 13th Gen Intel(R) Core(TM) i7-13620H
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, alderlake)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 16 virtual cores) ```

The workshop I’m using is : https://github.com/mfherbst/2022-rwth-julia-workshop
I’m going to try your idea and see what it does.

10

Pinging @mfh and @carstenbauer for help .

11

I am pretty sure the problem is the workshop’s old Manifest.toml:

This was meant to be used with Julia 1.8 and you are using Julia 1.12.6.

The next steps from here are either use Julia 1.8 (julia +1.8) or we try to update the workshop. Given some failed quick attempts at updating the workshop, it seems easier just to run Julia 1.8.5. You can do so by running julia +1.8 install.jl in that workshop.