<urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:600)>

[Runiko]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.12.31. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.12.31

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

PS C:\Users\Daniel> youtube-dl -v https://youtu.be/1SsZapRgXB0
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://youtu.be/1SsZapRgXB0']
[debug] Encodings: locale cp1250, fs mbcs, out cp852, pref cp1250
[debug] youtube-dl version 2017.12.31
[debug] Python version 3.4.4 - Windows-10-10.0.16299
[debug] exe versions: none
[debug] Proxy map: {}
[youtube] 1SsZapRgXB0: Downloading webpage
ERROR: Unable to download webpage: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:600)> (caused by URLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:600)'),))
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpiyv5xz5s\build\youtube_dl\extractor\common.py", line 517, in _request_webpage
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpiyv5xz5s\build\youtube_dl\YoutubeDL.py", line 2198, in urlopen
  File "C:\Python\Python34\lib\urllib\request.py", line 464, in open
  File "C:\Python\Python34\lib\urllib\request.py", line 482, in _open
  File "C:\Python\Python34\lib\urllib\request.py", line 442, in _call_chain
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpiyv5xz5s\build\youtube_dl\utils.py", line 1088, in https_open
  File "C:\Python\Python34\lib\urllib\request.py", line 1185, in do_open

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://youtu.be/1SsZapRgXB0

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Description of your issue, suggested solution and other information

I tried this with other videos (like this or this one) but it's still the same error.
The problem appeared after upgrade to version 2017.12.31.
I also reinstalled Python and youtube-dl a few times.

[dstftw]

#11573 (comment)