diff --git a/elytra_client/__init__.py b/elytra_client/__init__.py
index 8c9c132..f3a750c 100644
--- a/elytra_client/__init__.py
+++ b/elytra_client/__init__.py
@@ -1,6 +1,6 @@
 """Elytra PIM Client - A Pythonic client for the Elytra PIM API"""
 
-__version__ = "0.5.0"
+__version__ = "0.3.0"
 __author__ = "Your Name"
 
 from . import rest_api
diff --git a/pyproject.toml b/pyproject.toml
index 9a93664..d021b2e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "elytra-pim-client"
-version = "0.5.0"
+version = "0.3.0"
 description = "A Pythonic client for the Elytra PIM API"
 readme = "README.md"
 requires-python = ">=3.9"
@@ -44,8 +44,8 @@ Repository = "https://git.him-tools.de/HIM-public/elytra_client.git"
 Documentation = "https://www.elytra.ch/"
 Issues = "https://git.him-tools.de/HIM-public/elytra_client/issues"
 
-[tool.setuptools.packages.find]
-include = ["elytra_client*"]
+[tool.setuptools]
+packages = ["elytra_client"]
 
 [tool.black]
 line-length = 100
diff --git a/update_version.py b/update_version.py
index 6cf194b..9e05bc4 100644
--- a/update_version.py
+++ b/update_version.py
@@ -27,28 +27,24 @@ def validate_version(version: str) -> bool:
     Returns:
         True if valid, False otherwise
     """
-    pattern = r"^\d+\.\d+\.\d+(?:-[a-zA-Z0-9]+)?$"
+    pattern = r'^\d+\.\d+\.\d+(?:-[a-zA-Z0-9]+)?$'
     return bool(re.match(pattern, version))
 
 
-def update_file(
-    file_path: Path, old_pattern: str, new_version: str, multiline: bool = False
-) -> bool:
+def update_file(file_path: Path, old_pattern: str, new_version: str) -> bool:
     """Update version in a file.
 
     Args:
         file_path: Path to file to update
         old_pattern: Regex pattern to find version
         new_version: New version string
-        multiline: Whether to use multiline mode for regex
 
     Returns:
         True if successful, False otherwise
     """
     try:
         content = file_path.read_text()
-        flags = re.MULTILINE if multiline else 0
-        updated_content = re.sub(old_pattern, new_version, content, flags=flags)
+        updated_content = re.sub(old_pattern, new_version, content)
 
         if content == updated_content:
             print(f"✓ {file_path.name} already up-to-date")
@@ -93,10 +89,11 @@ def main() -> int:
 
     # Update pyproject.toml
     if pyproject_path.exists():
-        # Use word boundary to match 'version' but not 'python_version'
-        pattern = r'^version = "[^"]+"'
+        pattern = r'version = "[^"]+"'
         success &= update_file(
-            pyproject_path, pattern, f'version = "{new_version}"', multiline=True
+            pyproject_path,
+            pattern,
+            f'version = "{new_version}"'
         )
     else:
         print(f"✗ {pyproject_path} not found")
@@ -105,7 +102,11 @@ def main() -> int:
     # Update __init__.py
     if init_path.exists():
         pattern = r'__version__ = "[^"]+"'
-        success &= update_file(init_path, pattern, f'__version__ = "{new_version}"')
+        success &= update_file(
+            init_path,
+            pattern,
+            f'__version__ = "{new_version}"'
+        )
     else:
         print(f"✗ {init_path} not found")
         success = False