Installing from pip does not provide the latest version, requiring build from source

[kazuakiishiguro]

When attempting to install the package using pip, I noticed that the version obtained is not the latest one available. As a result, in order to use the most recent features and fixes, I am required to build the package from source. It would be helpful if the pip package could be updated to reflect the latest version of the project, ensuring a smoother installation process for users.