diff -BurN tmuxinator-3.1.2.orig/lib/tmuxinator/config.rb tmuxinator-3.1.2/lib/tmuxinator/config.rb
--- tmuxinator-3.1.2.orig/lib/tmuxinator/config.rb	2024-02-16 15:37:37.000000000 -0800
+++ tmuxinator-3.1.2/lib/tmuxinator/config.rb	2024-02-17 21:25:24.745199728 -0800
@@ -29,7 +29,7 @@
       # a custom value. (e.g. if $XDG_CONFIG_HOME is set to ~/my-config, the
       # return value will be ~/my-config/tmuxinator)
       def xdg
-        XDG["CONFIG"].to_s + "/tmuxinator"
+        XDG::Config.new.home.to_s + "/tmuxinator"
       end
 
       def xdg?
diff -BurN tmuxinator-3.1.2.orig/spec/lib/tmuxinator/config_spec.rb tmuxinator-3.1.2/spec/lib/tmuxinator/config_spec.rb
--- tmuxinator-3.1.2.orig/spec/lib/tmuxinator/config_spec.rb	2024-02-16 15:37:37.000000000 -0800
+++ tmuxinator-3.1.2/spec/lib/tmuxinator/config_spec.rb	2024-02-17 21:25:24.745199728 -0800
@@ -53,7 +53,8 @@
 
         Dir.mktmpdir do |dir|
           config_parent = "#{dir}/non_existent_parent/s"
-          allow(XDG).to receive(:[]).with("CONFIG").and_return config_parent
+          allow(XDG::Config).to receive_message_chain(:new, :home, :to_s).
+            and_return config_parent
           expect(described_class.directory).
             to eq "#{config_parent}/tmuxinator"
           expect(File.directory?("#{config_parent}/tmuxinator")).to be true
@@ -134,7 +135,8 @@
 
   describe "#xdg" do
     it "is $XDG_CONFIG_HOME/tmuxinator" do
-      expect(described_class.xdg).to eq "#{XDG['CONFIG_HOME']}/tmuxinator"
+      config_home = XDG::Config.new.home.to_s
+      expect(described_class.xdg).to eq "#{config_home}/tmuxinator"
     end
   end
 
diff -BurN tmuxinator-3.1.2.orig/tmuxinator.gemspec tmuxinator-3.1.2/tmuxinator.gemspec
--- tmuxinator-3.1.2.orig/tmuxinator.gemspec	2024-02-16 15:37:37.000000000 -0800
+++ tmuxinator-3.1.2/tmuxinator.gemspec	2024-02-17 21:25:24.745199728 -0800
@@ -41,7 +41,7 @@
 
   s.add_dependency "erubis", "~> 2.6"
   s.add_dependency "thor", "~> 1.3.0"
-  s.add_dependency "xdg", "~> 2.2", ">= 2.2.5"
+  s.add_dependency "xdg", ">= 4.3.0"
 
   s.add_development_dependency "activesupport", "< 5.0.0" # Please see issue #432
   s.add_development_dependency "awesome_print", "~> 1.2"