error processing pdf file - cryptography>=3.1 is required for AES algorithm

During the processing of a pdf file, this exception is raised 
 File "/usr/local/lib/python3.11/site-packages/pypdf/_crypt_providers/_fallback.py", line 69, in decrypt
    raise DependencyError(_DEPENDENCY_ERROR_STR)
pypdf.errors.DependencyError: cryptography>=3.1 is required for AES algorithm

**Environment:**
 - unstructured-api v0.0.79 hosted on my VM, called via Langchain API