Use pip to manage updates to Ansible Manager.
$sudo pip3.6 install --upgrade -v ansible-manager==1.2.6+2018.3.15 --extra-index-url https://registry.aws.itential.com/repository/ansible-manager/simple
...
Created temporary directory: /tmp/pip-ephem-wheel-cache-hpp3436z
Created temporary directory: /tmp/pip-req-tracker-m18dli2n
Created requirements tracker '/tmp/pip-req-tracker-m18dli2n'
Created temporary directory: /tmp/pip-install-k11d6prh
Looking in indexes: https://pypi.org/simple, https://registry.aws.itential.com/repository/ansible-manager/simple
Collecting ansible-manager==1.2.6+2018.3.15
...
...
Successfully installed ansible-manager-1.2.6+2018.3.15
Cleaning up...
Removed build tracker '/tmp/pip-req-tracker-m18dli2n'