diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index 4eacbac..13e3595 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -33,10 +33,10 @@ jobs:
       - uses: actions/checkout@v4
       - name: Check version
         if: ${{ startsWith(github.ref, 'refs/tags/v') }}
-        run: python version.py check "${{ github.ref }}"
+        run: pipx run pyverno check jsonobject/__init__.py "${{ github.ref }}"
       - name: Add untagged version suffix
         if: ${{ ! startsWith(github.ref, 'refs/tags/v') }}
-        run: python version.py update
+        run: pipx run pyverno update jsonobject/__init__.py
       - name: Build sdist
         run: pipx run build --sdist
       - uses: actions/upload-artifact@v4
diff --git a/version.py b/version.py
deleted file mode 100644
index 029c90f..0000000
--- a/version.py
+++ /dev/null
@@ -1,70 +0,0 @@
-"""Check or update version in __init__.py
-
-Usage:
-    python version.py check GITHUB_REF
-    python version.py update [GITHUB_SHA]
-"""
-import re
-import sys
-from datetime import datetime, timezone
-from pathlib import Path
-
-PACKAGE_NAME = "jsonobject"
-PACKAGE_PATH = Path(__file__).parent / PACKAGE_NAME / "__init__.py"
-V_EXPR = re.compile(r"""(?<=^__version__ = )['"](.+)['"]$""", flags=re.M)
-
-
-def main(argv=sys.argv):
-    if len(argv) < 2:
-        sys.exit(f"usage: {argv[0]} (check|update) [...]")
-    cmd, *args = sys.argv[1:]
-    if cmd in COMMANDS:
-        COMMANDS[cmd](*args)
-    else:
-        sys.exit(f"unknown arguments: {argv[1:]}")
-
-
-def check(ref):
-    if not ref.startswith("refs/tags/v"):
-        sys.exit(f"unexpected ref: {ref}")
-    tag_version = ref.removeprefix("refs/tags/v")
-    pkg_version = parse_version(get_module_text())
-    if tag_version != pkg_version:
-        sys.exit(f"version mismatch: {tag_version} != {pkg_version}")
-
-
-def update(sha=""):
-    """Add a timestamped dev version qualifier to the current version
-
-    Note: PyPI does not allow the "local" version component, which
-    is where this puts the git sha. Do not pass a sha argument when
-    updating the version for a PyPI release.
-    PyPI error: The use of local versions ... is not allowed
-    """
-    devv = datetime.now(timezone.utc).strftime("%Y%m%d%H%M%S")
-    if sha:
-        devv += f"+{sha[:7]}"
-    module_text = get_module_text()
-    version = f"{parse_version(module_text)}.dev{devv}"
-    print("new version:", version)
-    with open(PACKAGE_PATH, "w") as file:
-        file.write(V_EXPR.sub(repr(version), module_text))
-
-
-def get_module_text():
-    with open(PACKAGE_PATH, "r") as file:
-        return file.read()
-
-
-def parse_version(module_text):
-    match = V_EXPR.search(module_text)
-    if not match:
-        sys.exit(f"{PACKAGE_NAME}.__version__ not found")
-    return match.group(1)
-
-
-COMMANDS = {"check": check, "update": update}
-
-
-if __name__ == "__main__":
-    main()