diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..ab8787f
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,19 @@
+Ophis, Copyright (C) 2002-2024 Michael Martin and contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..558d310
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,7 @@
+include tests/*.oph
+include tests/*.bin
+include tests/*.py
+include tests/sub/*.oph
+include tests/sub/sub/*.oph
+graft examples
+graft platform
diff --git a/README b/README
index d593385..8a500f4 100644
--- a/README
+++ b/README
@@ -11,7 +11,7 @@ It is provided under the MIT license, reproduced below:
 
 ---
 
-Ophis, Copyright (C) 2002-2014 Michael Martin and contributors
+Ophis, Copyright (C) 2002-2024 Michael Martin and contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..b4eae9e
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,29 @@
+[build-system]
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "ophis-asm"
+version = "2.2.0"
+authors = [
+  { name="Michael Martin", email="mcmartin@gmail.com" },
+]
+description = "A cross-assembler for the 6502 series of chips"
+readme = "README"
+requires-python = ">=3.6"
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Development Status :: 5 - Production/Stable",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
+    "Topic :: Software Development :: Assemblers"
+]
+dependencies = []
+
+[project.scripts]
+ophis = "Ophis:ophis_argv"
+
+[tool.setuptools.package-dir]
+Ophis = "src/Ophis"
diff --git a/src/Ophis/CmdLine.py b/src/Ophis/CmdLine.py
index f3b8586..ec3760c 100644
--- a/src/Ophis/CmdLine.py
+++ b/src/Ophis/CmdLine.py
@@ -2,7 +2,7 @@
 
 import optparse
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/CorePragmas.py b/src/Ophis/CorePragmas.py
index d0cd96e..d66fc38 100644
--- a/src/Ophis/CorePragmas.py
+++ b/src/Ophis/CorePragmas.py
@@ -2,7 +2,7 @@
 
     Provides the core assembler directives."""
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/Environment.py b/src/Ophis/Environment.py
index 7d7546d..4a4d4d8 100644
--- a/src/Ophis/Environment.py
+++ b/src/Ophis/Environment.py
@@ -3,7 +3,7 @@
    Implements the symbol lookup, through nested environments -
    any non-temporary variable is stored at the top level."""
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/Errors.py b/src/Ophis/Errors.py
index 2704ec0..15b763d 100644
--- a/src/Ophis/Errors.py
+++ b/src/Ophis/Errors.py
@@ -3,7 +3,7 @@
     Keeps track of the number of errors inflicted so far, and
     where in the assembly the errors are occurring."""
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/Frontend.py b/src/Ophis/Frontend.py
index f2bd503..0793d0d 100644
--- a/src/Ophis/Frontend.py
+++ b/src/Ophis/Frontend.py
@@ -10,7 +10,7 @@ import sys
 import os
 import os.path
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/IR.py b/src/Ophis/IR.py
index a71fd36..3383179 100644
--- a/src/Ophis/IR.py
+++ b/src/Ophis/IR.py
@@ -3,7 +3,7 @@
     Classes for representing the Intermediate nodes upon which the
     assembler passes operate."""
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/Listing.py b/src/Ophis/Listing.py
index 186e2eb..e525188 100644
--- a/src/Ophis/Listing.py
+++ b/src/Ophis/Listing.py
@@ -4,7 +4,7 @@
     traditional to mix binary with reconstructed instructions that
     have all arguments precomputed. This class manages that."""
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/Macro.py b/src/Ophis/Macro.py
index aeea97c..3cdb5df 100644
--- a/src/Ophis/Macro.py
+++ b/src/Ophis/Macro.py
@@ -4,7 +4,7 @@
     set via .alias commands and prevented from escaping
     with .scope and .scend commands."""
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/Main.py b/src/Ophis/Main.py
index f1f8c2d..bae9635 100644
--- a/src/Ophis/Main.py
+++ b/src/Ophis/Main.py
@@ -3,7 +3,7 @@
     When invoked as main, interprets its command line and goes from there.
     Otherwise, use run_ophis(cmdline-list) to use it inside a script."""
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
@@ -109,7 +109,3 @@ def run_ophis(args):
 
     Ophis.CorePragmas.reset()
     return run_all()
-
-
-if __name__ == '__main__':
-    sys.exit(run_ophis(sys.argv[1:]))
diff --git a/src/Ophis/Opcodes.py b/src/Ophis/Opcodes.py
index 598f2ef..4bb0cbf 100644
--- a/src/Ophis/Opcodes.py
+++ b/src/Ophis/Opcodes.py
@@ -3,7 +3,7 @@
     Tables for the assembly of 6502-family instructions, mapping
     opcodes and addressing modes to binary instructions."""
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/Passes.py b/src/Ophis/Passes.py
index 8ef5292..7000e87 100644
--- a/src/Ophis/Passes.py
+++ b/src/Ophis/Passes.py
@@ -7,7 +7,7 @@
     very extensible; additional analyses or optimizations may be
     added as new subclasses of Pass."""
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
diff --git a/src/Ophis/__init__.py b/src/Ophis/__init__.py
index d29c4c7..00fb76d 100644
--- a/src/Ophis/__init__.py
+++ b/src/Ophis/__init__.py
@@ -1,5 +1,11 @@
 "Ophis - a cross-assembler for the 6502 series of chips"
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
+
+import sys
+import Ophis.Main
+
+def ophis_argv():
+    sys.exit(Ophis.Main.run_ophis(sys.argv[1:]))
diff --git a/src/setup.py b/src/setup.py
deleted file mode 100644
index 75f43fd..0000000
--- a/src/setup.py
+++ /dev/null
@@ -1,16 +0,0 @@
-from distutils.core import setup
-setup(name='Ophis',
-      version='2.1',
-      description='A cross-assembler for the 6502 series of processors',
-      url='https://github.com/michaelcmartin/Ophis',
-      author="Michael Martin",
-      author_email="mcmartin@gmail.com",
-      license="MIT",
-      long_description="Ophis is a cross-assembler for the 65xx series of "
-                       "chips. It supports the stock 6502 opcodes, the 65c02 "
-                       "extensions, and syntax for the \"undocumented "
-                       "opcodes\" in the 6510 chip used on the Commodore 64. "
-                       "(Syntax for these opcodes matches those given in the "
-                       "VICE team's documentation.)",
-      packages=['Ophis'],
-      scripts=['scripts/ophis'])
diff --git a/src/tools/opcodes/gensets.py b/src/tools/opcodes/gensets.py
index a779f8c..5119352 100755
--- a/src/tools/opcodes/gensets.py
+++ b/src/tools/opcodes/gensets.py
@@ -8,7 +8,7 @@ prologue = '"""' + """Opcodes file.
     Tables for the assembly of 6502-family instructions, mapping
     opcodes and addressing modes to binary instructions.""" + '"""' + """
 
-# Copyright 2002-2014 Michael C. Martin and additional contributors.
+# Copyright 2002-2024 Michael C. Martin and additional contributors.
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.