diff --git a/Gemfile b/Gemfile
index a4aaea9..574537c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,12 +1,14 @@
 source "https://rubygems.org"
 
 gem "roda"
+gem 'rake'
 
 # change to gunicorn or passenger if you prefer:
 gem "puma"
 
-group :development, :test do
-  gem "rerun"
+group :development do
+  gem 'rerun'
+  gem 'rubocop'
 end
 
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 733b9a3..24fea4d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,6 +3,7 @@ GEM
   specs:
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
+    ast (2.4.3)
     capybara (3.40.0)
       addressable
       matrix
@@ -15,42 +16,68 @@ GEM
     ffi (1.17.2)
     ffi (1.17.2-arm64-darwin)
     ffi (1.17.2-x86_64-darwin)
+    ffi (1.17.2-x86_64-linux-gnu)
+    json (2.13.2)
+    language_server-protocol (3.17.0.5)
+    lint_roller (1.1.0)
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     matrix (0.4.3)
     mini_mime (1.1.5)
-    mini_portile2 (2.8.9)
     minitest (5.25.5)
     nio4r (2.7.4)
-    nokogiri (1.18.8)
-      mini_portile2 (~> 2.8.2)
+    nokogiri (1.18.9-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.18.8-arm64-darwin)
+    nokogiri (1.18.9-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.18.8-x86_64-darwin)
+    nokogiri (1.18.9-x86_64-linux-gnu)
       racc (~> 1.4)
+    parallel (1.27.0)
+    parser (3.3.9.0)
+      ast (~> 2.4.1)
+      racc
+    prism (1.4.0)
     public_suffix (6.0.2)
-    puma (6.6.0)
+    puma (6.6.1)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (3.1.16)
+    rack (3.2.0)
     rack-test (2.2.0)
       rack (>= 1.3)
+    rainbow (3.1.1)
+    rake (13.3.0)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    regexp_parser (2.10.0)
+    regexp_parser (2.11.2)
     rerun (0.14.0)
       listen (~> 3.0)
-    roda (3.93.0)
+    roda (3.95.0)
       rack
+    rubocop (1.80.1)
+      json (~> 2.3)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.1.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 2.9.3, < 3.0)
+      rubocop-ast (>= 1.46.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 4.0)
+    rubocop-ast (1.46.0)
+      parser (>= 3.3.7.2)
+      prism (~> 1.4)
+    ruby-progressbar (1.13.0)
+    unicode-display_width (3.1.5)
+      unicode-emoji (~> 4.0, >= 4.0.4)
+    unicode-emoji (4.0.4)
     xpath (3.2.0)
       nokogiri (~> 1.8)
 
 PLATFORMS
   arm64-darwin
-  ruby
   x86_64-darwin
   x86_64-linux
 
@@ -58,8 +85,10 @@ DEPENDENCIES
   capybara
   minitest
   puma
+  rake
   rerun
   roda
+  rubocop
 
 BUNDLED WITH
-   2.6.9
+   2.7.1
diff --git a/README.md b/README.md
index 1a9b078..471149c 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,13 @@
 
 Example single file Roda web app. There are extra files for launching the server, running tests, the license, etc, but the app itself is all in app.rb.
 
+Prepare the environment with:
+
+```bash
+bundle install
+# could do "bundle update" instead if you want to fetch new versions of packages
+```
+
 Run tests with:
 
 ```bash