diff --git a/ruby/.ruby-version b/ruby/.ruby-version
new file mode 100644
index 0000000..fd2a018
--- /dev/null
+++ b/ruby/.ruby-version
@@ -0,0 +1 @@
+3.1.0
diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index 47b95df..254b503 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -27,6 +27,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-21
+  arm64-darwin-22
 
 DEPENDENCIES
   minitest (~> 5.15)
@@ -38,4 +39,4 @@ RUBY VERSION
    ruby 3.1.0p0
 
 BUNDLED WITH
-   2.3.3
+   2.4.6
diff --git a/ruby/a1 b/ruby/a1
index 55b8a20..6f81bd5 100755
--- a/ruby/a1
+++ b/ruby/a1
@@ -1,9 +1,6 @@
 #!/usr/bin/env ruby -w
 
 require 'English'
-
-$LOAD_PATH << File.expand_path(__dir__)
-
-require 'shell'
+require_relative './shell'
 
 Shell::CLI.new.run(args: ARGV) if $PROGRAM_NAME == __FILE__
diff --git a/ruby/shell.rb b/ruby/shell.rb
index 22df219..c113b43 100644
--- a/ruby/shell.rb
+++ b/ruby/shell.rb
@@ -1,3 +1,5 @@
+$LOAD_PATH << File.expand_path(__dir__)
+
 require 'shell/cli'
 require 'shell/repl'
 
diff --git a/ruby/test/shell_test.rb b/ruby/test/shell_test.rb
index 7500ae2..bbd31ea 100644
--- a/ruby/test/shell_test.rb
+++ b/ruby/test/shell_test.rb
@@ -18,7 +18,7 @@ class ShellTest < Minitest::Test
   end
 
   def test_expands_environment_variables
-    assert_equal ENV['HOME'], `#{A1_PATH} -c 'echo $HOME'`.chomp
+    assert_equal Dir.home, `#{A1_PATH} -c 'echo $HOME'`.chomp
     assert system("#{A1_PATH} -c 'echo $HOME' >/dev/null")
   end