diff --git a/CHANGELOG.md b/CHANGELOG.md
index bef723f..0a87f54 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,16 @@
 - Aligned `search()` parameters with the current documented API surface.
 - Modernized packaging metadata: updated repository URL, classifiers, and dependency pins.
 - Unified package version to `0.1.0` across `setup.py` and `currentsapi/__init__.py`.
+- Single-sourced the version: `setup.py` now reads `__version__` from
+  `currentsapi/__init__.py` instead of duplicating it.
+- Replaced the deprecated `tests_require` argument with an `extras_require`
+  `"dev"` extra (`pip install currentsapi[dev]`).
+- Removed obsolete `setup.cfg`: the `description-file` metadata key is
+  deprecated and the `universal` wheel flag is incorrect for a Python 3-only
+  package.
+- README now clarifies that the PyPI distribution name is `currentsapi`
+  (matching the 0.0.1/0.0.2 releases), documents `CurrentsAPIError` handling,
+  and states the supported Python versions.
 - Updated README with current docs link and usage examples.
 
 ### Fixed
diff --git a/README.md b/README.md
index e8c1a1d..b40a2f2 100644
--- a/README.md
+++ b/README.md
@@ -4,12 +4,16 @@ The official Python SDK for the [Currents API](https://currentsapi.services/en/d
 
 ## Installation
 
-Install the package from PyPI:
+Install the package from PyPI. The distribution name is `currentsapi` (this
+repository is `currentsapi-python`, and the Python import name is also
+`currentsapi`):
 
 ```bash
 pip install currentsapi
 ```
 
+Python 3.8+ is supported.
+
 ## Usage
 
 Import the client and initialize it with your API key:
@@ -76,3 +80,17 @@ Get your API key at [https://currentsapi.services/en/register](https://currentsa
 ## License
 
 MIT License
+
+## Error handling
+
+Any non-200 API response raises `CurrentsAPIError`, which exposes the parsed
+response body:
+
+```python
+from currentsapi.client import CurrentsAPIError
+
+try:
+    api.latest_news()
+except CurrentsAPIError as exc:
+    print(exc.status, exc.code, exc.message)
+```
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index b2445a8..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,5 +0,0 @@
-[metadata]
-description-file = README.md
-
-[bdist_wheel]
-universal=1
\ No newline at end of file
diff --git a/setup.py b/setup.py
index b8f2cf0..f286e8c 100644
--- a/setup.py
+++ b/setup.py
@@ -1,22 +1,32 @@
 #!/usr/bin/env python
 
+import re
+from pathlib import Path
+
 from setuptools import setup, find_packages
 
-with open("README.md", "r") as fh:
+ROOT = Path(__file__).parent
+
+with (ROOT / "README.md").open(encoding="utf-8") as fh:
     long_description = fh.read()
 
+with (ROOT / "currentsapi" / "__init__.py").open(encoding="utf-8") as fh:
+    version = re.search(r'^__version__ = "(.*?)"$', fh.read(), re.MULTILINE).group(1)
+
+extras_require = {
+    "dev": [
+        "pytest",
+    ],
+}
+
 install_requires = [
     "requests>=2.25.0",
     "python-dateutil>=2.8.0",
 ]
 
-tests_require = [
-    "pytest",
-]
-
 setup(
     name="currentsapi",
-    version="0.1.0",
+    version=version,
     author="Currents Dev",
     author_email="ray@currentsapi.services",
     license="MIT",
@@ -25,7 +35,7 @@
     long_description=long_description,
     long_description_content_type="text/markdown",
     install_requires=install_requires,
-    tests_require=tests_require,
+    extras_require=extras_require,
     description="Official Python client for the Currents API",
     keywords=["currentsapi", "news", "wrapper", "currents", "api"],
     classifiers=[