diff --git a/src/apis/pypi.py b/src/apis/pypi.py
index 14d3251..6f1fc5c 100644
--- a/src/apis/pypi.py
+++ b/src/apis/pypi.py
@@ -63,13 +63,12 @@ def clean_requirements_txt(previous_microservice_path):
             continue
 
         split = re.split(r'==|>=|<=|>|<|~=', line)
-        if len(split) == 1:
+        if len(split) == 1 or len(split) > 2:
             version = None
             package_name = split[0]
-        elif len(split) == 2:
-            package_name, version = split
         else:
-            raise ValueError(f'Could not parse line {line} in requirements.txt')
+            package_name, version = split
+
 
         # Keep lines with jina, docarray, openai, pytest unchanged
         if package_name in {'jina', 'docarray', 'openai', 'pytest'}:
@@ -79,7 +78,7 @@ def clean_requirements_txt(previous_microservice_path):
             if version is None or not is_package_on_pypi(package_name, version):
                 latest_version = get_latest_package_version(package_name)
                 if latest_version is None:
-                    raise ValueError(f'Package {package_name} not found on PyPI')
+                    continue
                 updated_requirements.append(f'{package_name}~={latest_version}')
             else:
                 updated_requirements.append(line)
diff --git a/test/unit/test_api.py b/test/unit/test_api.py
index f94782c..c3c1962 100644
--- a/test/unit/test_api.py
+++ b/test/unit/test_api.py
@@ -47,6 +47,8 @@ gtts~=2.2.3
 pydub~=123.123.123
 # non-existing package with correct version
 base64~=3.3.0
+# not parsable version
+pdfminer.six>=20201018,<20211018
 # existing package without version
 requests
 # another existing package without version
@@ -57,6 +59,7 @@ jina==111.222.333
 docarray==111.222.333
 gtts~=2.2.3
 pydub~=0.25.1
+pdfminer.six~=20201018
 requests~=2.26.0
 streamlit~=0.89.0"""
     requirements_txt_path = os.path.join(tmpdir, "requirements.txt")