diff --git a/nvchecker/__init__.py b/nvchecker/__init__.py
index 1b883a0..f1c1b2b 100644
--- a/nvchecker/__init__.py
+++ b/nvchecker/__init__.py
@@ -1,4 +1,4 @@
 # MIT licensed
 # Copyright (c) 2013-2024 lilydjwg <lilydjwg@gmail.com>, et al.
 
-__version__ = '2.15'
+__version__ = '2.15.1'
diff --git a/nvchecker_source/pypi.py b/nvchecker_source/pypi.py
index e565475..8cf0435 100644
--- a/nvchecker_source/pypi.py
+++ b/nvchecker_source/pypi.py
@@ -1,10 +1,13 @@
 # MIT licensed
-# Copyright (c) 2013-2021 lilydjwg <lilydjwg@gmail.com>, et al.
+# Copyright (c) 2013-2021,2023-2024 lilydjwg <lilydjwg@gmail.com>, et al.
 
-from packaging.version import Version
+import structlog
+from packaging.version import Version, InvalidVersion
 
 from nvchecker.api import RichResult
 
+logger = structlog.get_logger(logger_name=__name__)
+
 async def get_version(name, conf, *, cache, **kwargs):
   ret = []
 
@@ -16,7 +19,14 @@ async def get_version(name, conf, *, cache, **kwargs):
   data = await cache.get_json(url)
 
   for version in data['releases'].keys():
-    parsed_version = Version(version)
+    try:
+      parsed_version = Version(version)
+    except InvalidVersion:
+      if data['releases'][version]:
+        # emit a warning if there is something under the invalid version
+        # sympy has an empty "0.5.13-hg" version
+        logger.warning('ignoring invalid version', version=version)
+      continue
 
     if not use_pre_release and parsed_version.is_prerelease:
       continue
diff --git a/tests/test_pypi.py b/tests/test_pypi.py
index 18f8b0b..4ae01a8 100644
--- a/tests/test_pypi.py
+++ b/tests/test_pypi.py
@@ -26,3 +26,9 @@ async def test_pypi_list(get_version):
         "source": "pypi",
         "include_regex": "^1\\..*",
     }) == "1.26.18"
+
+async def test_pypi_invalid_version(get_version):
+    await get_version("sympy", {
+        "source": "pypi",
+    })
+