diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 13c9fad..1077a3c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,10 +1,3 @@
-# This workflow uses actions that are not certified by GitHub.
-# They are provided by a third-party and are governed by
-# separate terms of service, privacy policy, and support
-# documentation.
-# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
-# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
-
 name: Test
 
 on:
@@ -18,25 +11,19 @@ jobs:
   test:
 
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        ruby-version: ["3.0"]
 
     steps:
     - name: Checkout Code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v6.0.2
 
-    - name: Install dependencies
+    - name: Install system dependencies
       run: sudo apt install vim-gtk3 xvfb
 
-    - name: Set up Ruby
-    # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
-    # change this to (see https://github.com/ruby/setup-ruby#versioning):
-    # uses: ruby/setup-ruby@v1
-      uses: ruby/setup-ruby@473e4d8fe5dd94ee328fdfca9f8c9c7afc9dae5e
-      with:
-        ruby-version: ${{ matrix.ruby-version }}
-        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Set up Ruby via mise
+      uses: jdx/mise-action@v4.0.1
+
+    - name: Install gems
+      run: bundle install
 
     - name: Run headless tests
       run: xvfb-run -a bundle exec rspec
diff --git a/.tool-versions b/.tool-versions
deleted file mode 100644
index 059ca47..0000000
--- a/.tool-versions
+++ /dev/null
@@ -1 +0,0 @@
-ruby 3.1.0
diff --git a/Gemfile b/Gemfile
index 5e44fe6..d5d68a1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,8 +3,6 @@
 source 'https://rubygems.org'
 
 group :test do
-  gem 'pry'
-  gem 'pry-byebug'
   gem 'rake', '~> 12.3.3'
   gem 'rspec'
   gem 'rspec-retry'
diff --git a/Gemfile.lock b/Gemfile.lock
index 0f47b00..3002717 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,44 +1,46 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    byebug (10.0.2)
-    coderay (1.1.2)
-    diff-lcs (1.3)
-    method_source (0.9.0)
-    pry (0.11.3)
-      coderay (~> 1.1.0)
-      method_source (~> 0.9.0)
-    pry-byebug (3.6.0)
-      byebug (~> 10.0)
-      pry (~> 0.10)
+    diff-lcs (1.6.2)
     rake (12.3.3)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.2)
+    rspec (3.13.2)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.6)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.8)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
+      rspec-support (~> 3.13.0)
     rspec-retry (0.6.2)
       rspec-core (> 3.3)
-    rspec-support (3.8.0)
-    vimrunner (0.3.4)
+    rspec-support (3.13.7)
+    vimrunner (0.3.6)
 
 PLATFORMS
+  arm64-darwin-23
   ruby
 
 DEPENDENCIES
-  pry
-  pry-byebug
   rake (~> 12.3.3)
   rspec
   rspec-retry
   vimrunner
 
+CHECKSUMS
+  bundler (4.0.12) sha256=7f8b757d28dfb636e7b24fba2344ac6dd13b5b24f4b46d62573d483f211825ac
+  diff-lcs (1.6.2) sha256=9ae0d2cba7d4df3075fe8cd8602a8604993efc0dfa934cff568969efb1909962
+  rake (12.3.3) sha256=f7694adb4fe638da35452300cee6c545e9c377a0e3190018ac04d590b3c26ab3
+  rspec (3.13.2) sha256=206284a08ad798e61f86d7ca3e376718d52c0bc944626b2349266f239f820587
+  rspec-core (3.13.6) sha256=a8823c6411667b60a8bca135364351dda34cd55e44ff94c4be4633b37d828b2d
+  rspec-expectations (3.13.5) sha256=33a4d3a1d95060aea4c94e9f237030a8f9eae5615e9bd85718fe3a09e4b58836
+  rspec-mocks (3.13.8) sha256=086ad3d3d17533f4237643de0b5c42f04b66348c28bf6b9c2d3f4a3b01af1d47
+  rspec-retry (0.6.2) sha256=6101ba23a38809811ae3484acde4ab481c54d846ac66d5037ccb40131a60d858
+  rspec-support (3.13.7) sha256=0640e5570872aafefd79867901deeeeb40b0c9875a36b983d85f54fb7381c47c
+  vimrunner (0.3.6) sha256=b6c695eb6b6fa4ad28187a07219ef52726d952678d8fd7a9c7c90e88c5d828d2
+
 BUNDLED WITH
-   2.1.4
+  4.0.12
diff --git a/README.md b/README.md
index 4d6b485..2ca2e49 100644
--- a/README.md
+++ b/README.md
@@ -347,10 +347,20 @@ Just add above to your .vimrc
 
 The test suite is written using vimrunner. It is known to run on macOS with MacVim installed, and on travis. Your vim must have `+clientserver` and either have its own GUI or in a virtual X11 window.
 
-On your mac run:
+## Local Development Setup
+
+This project uses [mise](https://mise.jdx.dev) to manage the Ruby version. Install it, then run:
 
 ```sh
+mise install
 bundle install
+```
+
+## Running Tests
+
+On your mac run:
+
+```sh
 bundle exec rspec
 ```
 
diff --git a/mise.toml b/mise.toml
new file mode 100644
index 0000000..96bdb30
--- /dev/null
+++ b/mise.toml
@@ -0,0 +1,2 @@
+[tools]
+ruby = "4"