Cannot update python package on anaconda to latest version

Some of my python packages on anaconda cannot be updated to the latest version.

For instance, beautifulsoup4 latest version on anaconda is v4.71 as seen in the release notes. https://docs.anaconda.com/anaconda/reference/release-notes/

However, when I run conda update beautifulsoup4, the latest version that I can update to is v4.6.

I discovered that the channel used by beautifulsoup4 is pypi.

# Name                    Version                   Build  Channel
beautifulsoup4            4.6.0                    pypi_0    pypi 
bleach                    3.1.0                      py_0    conda-forge

I suspect if I were to change the channel from pypi to conda-forge, I should be able to update to the latest version.

How can I change the channel from pypi to conda-forge? Or does the solution lies somewhere else?

I am using Windows 10 64-bit, python 3.7.

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