diff --git a/.github/workflows/pypi.yaml b/.github/workflows/pypi.yaml
new file mode 100644
index 0000000..15dff36
--- /dev/null
+++ b/.github/workflows/pypi.yaml
@@ -0,0 +1,20 @@
+name: PyPI
+
+on:
+  release:
+    types:
+      - created
+
+jobs:
+  job:
+    name: PyPI
+    runs-on: ubuntu-latest
+    env:
+      POETRY_PYPI_TOKEN_PYPI: ${{ secrets.PYPI_TOKEN }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.12"
+      - name: Publish package to PyPI
+        run: pip install poetry && poetry publish --build
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
new file mode 100644
index 0000000..e52490d
--- /dev/null
+++ b/.github/workflows/tests.yaml
@@ -0,0 +1,33 @@
+name: Tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  job:
+    name: Test (Python ${{ matrix.python }})
+    runs-on: ubuntu-latest
+    env:
+      POETRY_VIRTUALENVS_CREATE: false
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["3.9", "3.10", "3.11", "3.12"]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Install project dependencies
+        run: pip install poetry && poetry install
+      - name: Test code's formatting (Black)
+        run: black --check deshima_rawdata tests
+      - name: Test code's typing (Pyright)
+        run: pyright deshima_rawdata tests
+      - name: Test code's execution (pytest)
+        run: pytest -v tests
diff --git a/README.md b/README.md
index 0ab81d8..c84c143 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,17 @@
 # rawdata
-:truck: DESHIMA raw data and downloader package
+DESHIMA raw data and downloader package
+
+# Usage
+
+```
+$ pip install deshima-rawdata
+$ deshima-rawdata download <obsid>
+```
+
+# List of raw data
+
+| Observation ID | File name | Source | Observation type |
+| --- | --- | --- | --- |
+| 20231108052231 | 20231108052231.tar.gz | Jupiter | contmap |
+| 20231109015146 | 20231109015146.tar.gz | Jupiter | zscan |
+| 20231109060113 | 20231109060113.tar.gz | Blank sky | skydip |
diff --git a/data/20231108052231.tar.gz b/data/20231108052231.tar.gz
new file mode 100644
index 0000000..01746af
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diff --git a/data/20231109015146.tar.gz b/data/20231109015146.tar.gz
new file mode 100644
index 0000000..27e8ea5
Binary files /dev/null and b/data/20231109015146.tar.gz differ
diff --git a/data/20231109060113.tar.gz b/data/20231109060113.tar.gz
new file mode 100644
index 0000000..e6da27d
Binary files /dev/null and b/data/20231109060113.tar.gz differ
diff --git a/deshima_rawdata/cli.py b/deshima_rawdata/cli.py
index bef05dc..bb7cbcd 100644
--- a/deshima_rawdata/cli.py
+++ b/deshima_rawdata/cli.py
@@ -2,6 +2,7 @@
 
 
 # standard library
+import tarfile
 from pathlib import Path
 
 
@@ -14,6 +15,7 @@
 
 # constants
 CHUNK_SIZE = 1024
+DEFAULT_TAG = f"v{__version__}"
 GITHUB_URL = "https://raw.githubusercontent.com/deshima-dev/rawdata"
 
 
@@ -22,27 +24,31 @@ def download(
     /,
     *,
     dir: Path = Path(),
-    progress: bool = True,
+    extract: bool = False,
+    progress: bool = False,
+    tag: str = DEFAULT_TAG,
 ) -> Path:
     """Download DESHIMA raw data for given observation ID.
 
     Args:
         obsid: Observation ID (YYYYmmddHHMMSS).
         dir: Directory where the raw data is saved.
+        extract: Whether to extract the raw data.
         progress: Whether to show a progress bar.
+        tag: Git tag (or branch) of the raw data.
 
     Returns:
         Path of the downloaded raw data.
 
     """
-    url = f"{GITHUB_URL}/v{__version__}/data/{obsid}.tar.gz"
+    url = f"{GITHUB_URL}/{tag}/data/{obsid}.tar.gz"
 
     if not (response := get(url, stream=True)).ok:
         response.raise_for_status()
 
     bar_options = {
         "disable": not progress,
-        "total": int(response.headers.get("content-length", 0)),
+        "total": int(response.headers["content-length"]),
         "unit": "B",
         "unit_scale": True,
     }
@@ -53,7 +59,15 @@ def download(
             bar.update(len(data))
             f.write(data)
 
-    return data_path
+    if not extract:
+        return data_path
+
+    with tarfile.open(data_path, "r:gz") as tar:
+        tar.extractall(data_path.parent)
+        dir_name = tar.getnames()[0]
+
+    data_path.unlink(True)
+    return data_path.parent / dir_name
 
 
 def main() -> None:
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..1d89018
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,2 @@
+def test_download() -> None:
+    pass