diff --git a/.gitignore b/.gitignore
index 9d99c46..70f5900 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,8 +4,8 @@
 /dist
 /build
 /pyaegis/build
-/pyaegis/_aegis.*.so
-/pyaegis/_aegis.*.pyd
+/pyaegis/_aegis*.so
+/pyaegis/_aegis*.pyd
 __pycache__
 !.gitignore
 !.gitmodules
diff --git a/MANIFEST.in b/MANIFEST.in
index 13c5f9b..d24e1a7 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -4,10 +4,8 @@ include tools/build_backend.py
 include BUILD.md
 include README.md
 recursive-include libaegis *.c *.h *.zig *.zon
-include libaegis/CMakeLists.txt
 include libaegis/LICENSE
 include libaegis/README.md
-recursive-include libaegis/cmake *.cmake *.cmake.in
 graft libaegis/src
 include libaegis/build.zig
 include libaegis/build.zig.zon
diff --git a/pyproject.toml b/pyproject.toml
index 609877f..d71cb2a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,11 +1,11 @@
 [build-system]
-requires = ["setuptools>=61.0", "cffi>=2.0.0"]
+requires = ["setuptools>=61.0", "cffi>=2.0.0", "setuptools-scm>=8.0"]
 build-backend = "build_backend"
 backend-path = ["tools"]
 
 [project]
 name = "pyaegis"
-version = "0.3.1"
+dynamic = ["version"]
 description = "Python bindings for libaegis"
 requires-python = ">=3.10"
 classifiers = [
@@ -25,7 +25,9 @@ Homepage = "https://github.com/LeoVasanko/pyaegis"
 [dependency-groups]
 dev = [
     "pytest>=8.4.2",
+    "ruff>=0.14.4",
     "setuptools>=80.9.0",
+    "setuptools-scm>=9.2.2",
 ]
 
 [tool.setuptools]
@@ -33,3 +35,5 @@ packages = ["pyaegis"]
 
 [tool.setuptools.package-data]
 pyaegis = ["*.h", "*.so", "*.pyd"]
+
+[tool.setuptools_scm]
diff --git a/setup.py b/setup.py
index d26aeec..7fd3de2 100644
--- a/setup.py
+++ b/setup.py
@@ -1,28 +1,24 @@
-"""Setup script for pyaegis - builds CFFI extension linking to libaegis.a"""
+"""Setup script for pyaegis - builds CFFI extension with libaegis C library."""
 
+import os
+import sys
 from pathlib import Path
 
 from cffi import FFI
 from setuptools import setup
 
+# Locate the static library (built by build_backend.py before this runs)
+lib_name = "aegis.lib" if sys.platform == "win32" else "libaegis.a"
+libaegis_static = Path("libaegis/zig-out/lib") / lib_name
+if not libaegis_static.exists():
+    raise RuntimeError(f"libaegis static library not found at {libaegis_static}")
+libaegis_static = str(libaegis_static.resolve())
 
-def find_libaegis():
-    """Locate libaegis.a - check common locations."""
-    libaegis_paths = [
-        Path("libaegis/zig-out/lib/libaegis.a"),  # Zig build output (repo build)
-        Path("libaegis/build/libaegis.a"),  # CMake build output (repo build)
-        Path("/usr/local/lib/libaegis.a"),  # System install
-        Path("/usr/lib/libaegis.a"),  # System install
-    ]
-
-    for path in libaegis_paths:
-        if path.exists():
-            print(f"Found libaegis.a at: {path.resolve()}")
-            return str(path.resolve())
-
-    # Return None instead of raising - will be caught during build
-    return None
-
+# Include directory for headers
+libaegis_include = Path("libaegis/src/include")
+if not libaegis_include.exists():
+    raise RuntimeError(f"libaegis include directory not found at {libaegis_include}")
+include_dirs = [str(libaegis_include)]
 
 # Read the CDEF header
 cdef_path = Path(__file__).parent / "pyaegis" / "aegis_cdef.h"
@@ -32,15 +28,6 @@ cdef_content = cdef_path.read_text(encoding="utf-8")
 ffibuilder = FFI()
 ffibuilder.cdef(cdef_content)
 
-# Include directory for headers
-include_dirs = []
-libaegis_include = Path("libaegis/src/include")
-if libaegis_include.exists():
-    include_dirs.append(str(libaegis_include.resolve()))
-
-# Try to find libaegis.a, but don't fail if not found (build backend will build it)
-libaegis_static = find_libaegis()
-
 # Set the source
 ffibuilder.set_source(
     "pyaegis._aegis",  # module name
@@ -54,7 +41,7 @@ ffibuilder.set_source(
     #include "aegis256x4.h"
     """,
     include_dirs=include_dirs,
-    extra_objects=[libaegis_static] if libaegis_static else [],
+    extra_objects=[libaegis_static],
 )
 
 if __name__ == "__main__":