diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fd382e5..05dfea9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,13 +11,16 @@ jobs:
   ci:
     runs-on: ubuntu-latest
     name: RSpec and Rubocop
+    strategy:
+      matrix:
+        ruby: ['3.4', '4.0']
     timeout-minutes: 3
     steps:
       - uses: actions/checkout@v3
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: ${{ env.ruby_version }}
+          ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
       - name: Run rspec
         run: bundle exec rspec
diff --git a/.rubocop.yml b/.rubocop.yml
index fdde201..2bc38f4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 3.2
+  TargetRubyVersion: 4.0
   NewCops: enable
 
 inherit_gem:
diff --git a/.ruby-version b/.ruby-version
index 4f5e697..43beb40 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.5
+4.0.7
diff --git a/Gemfile.lock b/Gemfile.lock
index ec5b13f..d99c01a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,36 +9,36 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.3)
-    bigdecimal (3.2.3)
-    byebug (12.0.0)
+    bigdecimal (4.1.3)
+    byebug (13.0.0)
+      reline (>= 0.6.0)
     coderay (1.1.3)
     diff-lcs (1.6.2)
-    docile (1.4.1)
-    ffi (1.17.2-x86_64-linux-gnu)
-    foobara (0.1.7)
+    ffi (1.17.4-arm64-darwin)
+    ffi (1.17.4-x86_64-linux-gnu)
+    foobara (0.6.4)
       bigdecimal
       foobara-lru-cache (< 2.0.0)
       foobara-util (< 2.0.0)
       inheritable-thread-vars (< 2.0.0)
-    foobara-files-generator (0.1.0)
+    foobara-files-generator (0.1.5)
       foobara (>= 0.1.1, < 2.0.0)
     foobara-lru-cache (1.0.0)
-    foobara-rubocop-rules (1.0.2)
+    foobara-rubocop-rules (1.1.1)
       rubocop
       rubocop-rspec
-    foobara-spec-helpers (0.0.4)
+    foobara-spec-helpers (0.1.1)
       foobara-util
-    foobara-util (1.0.2)
-    formatador (1.2.0)
+    foobara-util (1.1.0)
+    formatador (1.2.3)
       reline
-    guard (2.19.1)
+    guard (2.20.2)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
       logger (~> 1.6)
       lumberjack (>= 1.0.12, < 2.0)
       nenv (~> 0.1)
       notiffany (~> 0.0)
-      ostruct (~> 0.6)
       pry (>= 0.13.0)
       shellany (~> 0.0)
       thor (>= 0.18.1)
@@ -48,46 +48,47 @@ GEM
       guard-compat (~> 1.1)
       rspec (>= 2.99.0, < 4.0)
     inheritable-thread-vars (0.0.3)
-    io-console (0.8.1)
-    json (2.13.2)
-    language_server-protocol (3.17.0.5)
+    io-console (0.9.4)
+    json (3.0.2)
+    language_server-protocol (3.17.0.6)
     lint_roller (1.1.0)
-    listen (3.9.0)
+    listen (3.10.0)
+      logger
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     logger (1.7.0)
-    lumberjack (1.4.1)
+    lumberjack (1.4.2)
     method_source (1.1.0)
     nenv (0.3.0)
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    ostruct (0.6.3)
-    parallel (1.27.0)
-    parser (3.3.9.0)
+    parallel (2.2.0)
+    parser (3.3.12.0)
       ast (~> 2.4.1)
       racc
-    prism (1.4.0)
-    pry (0.15.2)
+    prism (1.9.0)
+    pry (0.16.0)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    pry-byebug (3.11.0)
-      byebug (~> 12.0)
-      pry (>= 0.13, < 0.16)
+      reline (>= 0.6.0)
+    pry-byebug (3.12.0)
+      byebug (~> 13.0)
+      pry (>= 0.13, < 0.17)
     racc (1.8.1)
     rainbow (3.1.1)
-    rake (13.3.0)
+    rake (13.4.2)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    regexp_parser (2.11.2)
-    reline (0.6.2)
+    regexp_parser (2.13.0)
+    reline (0.7.0)
       io-console (~> 0.5)
-    rspec (3.13.1)
+    rspec (3.13.2)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
       rspec-mocks (~> 3.13.0)
-    rspec-core (3.13.5)
+    rspec-core (3.13.6)
       rspec-support (~> 3.13.0)
     rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
@@ -95,44 +96,41 @@ GEM
     rspec-its (2.0.0)
       rspec-core (>= 3.13.0)
       rspec-expectations (>= 3.13.0)
-    rspec-mocks (3.13.5)
+    rspec-mocks (3.13.8)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-support (3.13.5)
-    rubocop (1.80.2)
-      json (~> 2.3)
+    rspec-support (3.13.7)
+    rubocop (1.91.0)
+      json (>= 2.3)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.1.0)
-      parallel (~> 1.10)
+      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)
+      rubocop-ast (>= 1.49.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 4.0)
-    rubocop-ast (1.46.0)
+    rubocop-ast (1.50.0)
       parser (>= 3.3.7.2)
-      prism (~> 1.4)
+      prism (~> 1.7)
     rubocop-rake (0.7.1)
       lint_roller (~> 1.1)
       rubocop (>= 1.72.1)
-    rubocop-rspec (3.7.0)
+    rubocop-rspec (3.10.2)
       lint_roller (~> 1.1)
-      rubocop (~> 1.72, >= 1.72.1)
+      regexp_parser (>= 2.0)
+      rubocop (~> 1.86, >= 1.86.2)
     ruby-progressbar (1.13.0)
     shellany (0.0.1)
-    simplecov (0.22.0)
-      docile (~> 1.1)
-      simplecov-html (~> 0.11)
-      simplecov_json_formatter (~> 0.1)
-    simplecov-html (0.13.2)
-    simplecov_json_formatter (0.1.4)
-    thor (1.4.0)
-    unicode-display_width (3.1.5)
-      unicode-emoji (~> 4.0, >= 4.0.4)
-    unicode-emoji (4.0.4)
+    simplecov (1.3.1)
+    thor (1.5.0)
+    unicode-display_width (3.3.0)
+      unicode-emoji (~> 4.3)
+    unicode-emoji (4.3.0)
 
 PLATFORMS
+  arm64-darwin-25
   x86_64-linux
 
 DEPENDENCIES
@@ -150,7 +148,7 @@ DEPENDENCIES
   simplecov
 
 RUBY VERSION
-   ruby 3.4.1p0
+  ruby 3.4.1p0
 
 BUNDLED WITH
-   2.4.14
+  4.0.21
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index c7afb40..9f3ff4f 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -6,6 +6,7 @@
 require "pry-byebug"
 require "rspec/its"
 require "simplecov"
+Warning[:deprecated] = true
 
 SimpleCov.start do
   # enable_coverage :branch
diff --git a/src/command_generator.rb b/src/command_generator.rb
index a519f69..7c5ee53 100644
--- a/src/command_generator.rb
+++ b/src/command_generator.rb
@@ -12,9 +12,9 @@ def manifest_to_generator_classes(manifest)
                   Generators::CommandSpecGenerator
                 ]
               else
-                # :nocov:
+                # simplecov:disable
                 raise "Not sure how build a generator for a #{manifest}"
-                # :nocov:
+                # simplecov:enable
               end
             end
           end
diff --git a/src/generate_command.rb b/src/generate_command.rb
index 9b4334c..15c521e 100644
--- a/src/generate_command.rb
+++ b/src/generate_command.rb
@@ -1,5 +1,3 @@
-require "pathname"
-
 require_relative "command_config"
 
 module Foobara
@@ -31,9 +29,9 @@ def base_generator
         # TODO: delegate this to base_generator
         def templates_dir
           # TODO: implement this?
-          # :nocov:
+          # simplecov:disable
           "#{__dir__}/../templates"
-          # :nocov:
+          # simplecov:enable
         end
 
         def add_initial_elements_to_generate
diff --git a/src/write_command_to_disk.rb b/src/write_command_to_disk.rb
index 75a9eaf..a25f0ff 100644
--- a/src/write_command_to_disk.rb
+++ b/src/write_command_to_disk.rb
@@ -45,14 +45,14 @@ def run_post_generation_tasks
         end
 
         def rubocop_autocorrect
-          # :nocov:
+          # simplecov:disable
           Open3.popen3("bundle exec rubocop --no-server -A") do |_stdin, _stdout, stderr, wait_thr|
             exit_status = wait_thr.value
             unless exit_status.success?
               raise "could not rubocop --no-server -A. #{stderr.read}"
             end
           end
-          # :nocov:
+          # simplecov:enable
         end
       end
     end