diff --git a/lib/n65.rb b/lib/n65.rb
index 3412986..80f2ab5 100644
--- a/lib/n65.rb
+++ b/lib/n65.rb
@@ -15,7 +15,9 @@ module N65
     class INESHeaderAlreadySet < StandardError; end
     class FileNotFound < StandardError; end
 
-    # Assemble from an asm file to a nes ROM
+    State = Data.define(:program_counter, :segment, :bank, :scope)
+
+    # Assemble from an asm file to a NES ROM
     # TODO: This really needs a logger instead of all these unless quiet conditions
     def self.from_file(infile, options)
       raise(FileNotFound, infile) unless File.exist?(infile)
@@ -92,18 +94,13 @@ module N65
     def get_current_state
       saved_program_counter, saved_segment, saved_bank = @program_counter, @current_segment, @current_bank
       saved_scope = symbol_table.scope_stack.dup
-      OpenStruct.new(
-        program_counter: saved_program_counter,
-        segment: saved_segment,
-        bank: saved_bank,
-        scope: saved_scope
-      )
+      State.new(saved_program_counter, saved_segment, saved_bank, saved_scope)
     end
 
-    # Set the current state from an OpenStruct
-    def set_current_state(struct)
-      @program_counter, @current_segment, @current_bank = struct.program_counter, struct.segment, struct.bank
-      symbol_table.scope_stack = struct.scope.dup
+    # Set the current state
+    def set_current_state(state)
+      @program_counter, @current_segment, @current_bank = state.program_counter, state.segment, state.bank
+      symbol_table.scope_stack = state.scope.dup
     end
 
     # This is the main assemble method, it parses one line into an object
diff --git a/lib/n65/version.rb b/lib/n65/version.rb
index 9a713e9..f2d239f 100644
--- a/lib/n65/version.rb
+++ b/lib/n65/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module N65
-  VERSION ||= '0.5.3'
+  VERSION ||= '1.0.0'
 end
diff --git a/n65.gemspec b/n65.gemspec
index 0bae6ca..a683c94 100644
--- a/n65.gemspec
+++ b/n65.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 2.4.0'
+  spec.required_ruby_version = '>= 3.2.0'
 
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'rake'
diff --git a/spec/assembler_spec.rb b/spec/assembler_spec.rb
index 2322e76..fddebcd 100644
--- a/spec/assembler_spec.rb
+++ b/spec/assembler_spec.rb
@@ -10,7 +10,7 @@ RSpec.describe(N65::Assembler) do
     end
 
     let(:source) do
-      File.read(File.join(examples, filename))
+      File.read(filename)
     end
 
     let(:assembler) do
@@ -18,7 +18,9 @@ RSpec.describe(N65::Assembler) do
     end
 
     let(:binary) do
-      assembler.assemble_string(source).emit_binary_rom
+      Dir.chdir(examples) do
+        assembler.assemble_string(source).emit_binary_rom
+      end
     end
 
     let(:sha256) do
@@ -70,7 +72,7 @@ RSpec.describe(N65::Assembler) do
       end
     end
 
-    context 'when assembling mario2.asm', skip: '.incbin include path should be relative to source file' do
+    context 'when assembling mario2.asm' do
       let(:filename) { 'mario2.asm' }
       let(:expected) { '0974b799eac7ffb8835fcbd518a5cdeeec734d5d9476cd11cb6b75491c6ef488' }