diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 4191aa3..d597369 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "content/tils/predictable_seed_data.md",
+                "file": "content/tils/mac_sonoma_zsh_asdf_erlang_elixir.md",
                 "mode": "source",
                 "source": false
               }
@@ -85,7 +85,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "content/tils/predictable_seed_data.md",
+                "file": "content/tils/mac_sonoma_zsh_asdf_erlang_elixir.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -112,7 +112,7 @@
             "state": {
               "type": "file-properties",
               "state": {
-                "file": "content/tils/predictable_seed_data.md"
+                "file": "content/tils/mac_sonoma_zsh_asdf_erlang_elixir.md"
               }
             }
           }
@@ -135,13 +135,14 @@
   },
   "active": "23b55eaa334e54e2",
   "lastOpenFiles": [
+    "content/tils/predictable_seed_data.md",
+    "content/tils/mac_sonoma_zsh_asdf_erlang_elixir.md",
     "_site/tils/predictable_seed_data/index.html",
     "_site/tils/predictable_seed_data",
     "_site/images/predictable_data.png",
     "content/tils/kagi_small_web.md",
     "content/tils/pdf_obsidian_at_page.md",
     "content/tils/asdf_direnv.md",
-    "content/tils/predictable_seed_data.md",
     "content/til.md",
     "content/images/predictable_data.png",
     "content/tils/always_generated_ecto_boolean.md",
@@ -161,7 +162,6 @@
     "content/tils/til.njk",
     "_site/til.xml",
     "_site/tils/always_generated_ecto_boolean/index.html",
-    "_site/tils/pdf_obsidian_at_page/index.html",
     "_site/images/til-pdf-page.png",
     "node_modules/@11ty/eleventy-plugin-syntaxhighlight/README.md",
     "node_modules/@11ty/eleventy-plugin-syntaxhighlight/test/issue-80/index.md",
diff --git a/content/tils/mac_sonoma_zsh_asdf_erlang_elixir.md b/content/tils/mac_sonoma_zsh_asdf_erlang_elixir.md
new file mode 100644
index 0000000..ca0958a
--- /dev/null
+++ b/content/tils/mac_sonoma_zsh_asdf_erlang_elixir.md
@@ -0,0 +1,33 @@
+---
+title: Resolving zsh bus error with erlang/elixir on Mac Sonoma with asdf
+date: 2023-11-27
+---
+A perfect storm of tooling hit me with a difficult to decipher error this morning `zsh bus error mix`. [Others seem to have had similar woes](https://elixirforum.com/t/bus-error-after-upgrading-to-sonoma-beta/56354/41) and I was able to decipher a clean reproducible solution.
+
+The tooling needed to run into this issue:
+
+- Mac upgraded to Sonoma
+- Using `asdf` to manage `erlang` and `elixir`
+- Using `zsh`
+
+```sh
+# upgrade some system dependencies, and asdf itself
+brew update
+brew upgrade # mostly to update asdf, can target specifically with `brew upgrade asdf` instead
+
+# remove existing erlang and elixir installs, reshimming won't cut it so let's start fresh it doesn't take long
+asdf plugin-remove erlang
+asdf plugin-remove elixir
+
+# reinstall those plugins
+asdf plugin add erlang [https://github.com/asdf-vm/asdf-erlang.git](https://github.com/asdf-vm/asdf-erlang.git)
+asdf plugin-add elixir [https://github.com/asdf-vm/asdf-elixir.git](https://github.com/asdf-vm/asdf-elixir.git)
+
+# now let's install the versions App needs of erlang and elixir
+cd ./where-my-repos-are/app
+export KERL_CONFIGURE_OPTIONS="--disable-debug --without-javac" # recommended step by asdf erlang's readme
+asdf install # pulls from app's `.tool-versions` file
+
+# done! try it out
+mix deps.get
+```
\ No newline at end of file