diff --git a/ruby/.ruby-version b/ruby/.ruby-version
deleted file mode 100644
index 84d6c67..0000000
--- a/ruby/.ruby-version
+++ /dev/null
@@ -1 +0,0 @@
-3.4.10
diff --git a/ruby/.tool-versions b/ruby/.tool-versions
new file mode 100644
index 0000000..380cf51
--- /dev/null
+++ b/ruby/.tool-versions
@@ -0,0 +1 @@
+ruby 3.4
diff --git a/ruby/README.md b/ruby/README.md
index 77e4577..5a3fcd7 100644
--- a/ruby/README.md
+++ b/ruby/README.md
@@ -1,17 +1,32 @@
 # Ruby
 
-Pairing test starter project for Ruby with rspec for testing.
+Skeleton project for Ruby.
+
+## Prerequisites
+
+The toolchain this project needs is declared in [`.tool-versions`](./.tool-versions):
+
+```
+ruby 3.4
+```
+
+Install those however you prefer, as long as they end up on your `PATH`. The quickest route is
+[mise](https://mise.jdx.dev/), which reads the file for you:
+
+```sh
+mise install
+```
 
 ## Usage
-- `./script/setup` to install dependencies
+- `./script/setup` to fetch dependencies
 - `./script/test` to run the tests
-- `./script/start` to run the code
+- `./script/start` to run the app
 - `./script/console` for an interactive prompt
 
 ## Structure
-- Code located in [pairing_test.rb](./lib/pairing_test.rb)
-- Tests located in [pairing_test_spec.rb](./spec/pairing_test_spec.rb)
+- Code located in [`pairing_test.rb`](./lib/pairing_test.rb)
+- Tests located in [`pairing_test_spec.rb`](./spec/pairing_test_spec.rb)
 
 `lib` has been added to the `require` path so all imports inside the `lib` directory must be relative to this, e.g. `require "pairing_test/version"`.
 
-However, you're free to organise your code as you like. 
+However, you're free to organise your code as you like.
diff --git a/ruby/script/setup b/ruby/script/setup
index 1ba28af..29df332 100755
--- a/ruby/script/setup
+++ b/ruby/script/setup
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
+
 set -euo pipefail
-IFS=$'\n\t'
-set -vx
 
-gem install bundler
+cd "$(dirname "${BASH_SOURCE[0]}")/.."
+
 bundle install
diff --git a/ruby/script/test b/ruby/script/test
index 2d784f2..5cafbd0 100755
--- a/ruby/script/test
+++ b/ruby/script/test
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
-set -e
+set -euo pipefail
 
-rake spec
+cd "$(dirname "${BASH_SOURCE[0]}")/.."
+
+bundle exec rake spec