Unable to contact PyPi, can't check for update: ValueError(u"invalid version number '9.3.18.dev1'",)

Before submitting your issue:

Enable debug logging from settings in SiCKRAGE then try and reproduce the error

Summary
Happens every-time update request both automatic and manual

Branch/Commit
9.3.21

OS
Docker on Synology DSM 6.1.6-15266 Update 1

Steps to reproduce
Manual update and automatic update

What is the current bug behavior?
Shows as warnings

What is the expected correct behavior?
No warning, update should not come with error version, as the version is 9.3.21, somehow the system think is still 9.2.18.dev1

Relevant logs and/or screenshots
09:10:56 DEBUG::TORNADO::Checking if we can use pip commands: /usr/local/bin/pip -V
09:10:56 DEBUG::TORNADO::Executing /usr/local/bin/pip -V with your shell in /usr/local/lib/python2.7/site-packages/sickrage
09:10:57 DEBUG::TORNADO::/usr/local/bin/pip -V : returned successful
09:10:57 DEBUG::TORNADO::Using: /usr/local/bin/pip
09:10:57 DEBUG::TORNADO::Executing /usr/local/bin/pip show sickrage with your shell in /usr/local/lib/python2.7/site-packages/sickrage
09:10:58 DEBUG::TORNADO::/usr/local/bin/pip show sickrage : returned successful
09:10:58 DEBUG::TORNADO::Checking if we can use pip commands: /usr/local/bin/pip -V
09:10:59 DEBUG::TORNADO::Executing /usr/local/bin/pip -V with your shell in /usr/local/lib/python2.7/site-packages/sickrage
09:10:59 DEBUG::TORNADO::/usr/local/bin/pip -V : returned successful
09:10:59 DEBUG::TORNADO::Using: /usr/local/bin/pip
09:10:59 DEBUG::TORNADO::Executing /usr/local/bin/pip show sickrage with your shell in /usr/local/lib/python2.7/site-packages/sickrage
09:11:01 DEBUG::TORNADO::/usr/local/bin/pip show sickrage : returned successful
09:11:02 DEBUG::TORNADO::GET URL: https://pypi.python.org/pypi/sickrage/json [Status: 301]
09:11:02 DEBUG::TORNADO::User-Agent: SiCKRAGE.CE.1/(Linux;4.4.15+;60fc7fe8-58a2-11e8-b052-0242ac110006)
09:11:03 DEBUG::TORNADO::GET URL: https://pypi.org/pypi/sickrage/json [Status: 200]
09:11:03 DEBUG::TORNADO::User-Agent: SiCKRAGE.CE.1/(Linux;4.4.15+;60fc7fe8-58a2-11e8-b052-0242ac110006)
09:11:03 WARNING::TORNADO::Unable to contact PyPi, can't check for update: ValueError( u"invalid version number '9.3.18.dev1'",)

Possible fixes
No idea