How to Scrape a website without disabling ssl - ruby-on-rails

Question

I have to scrape a website without disabling SSL. I tried by using Nokogiri gem
require 'httparty'
require 'nokogiri'
require 'open-uri'
page = open("https://mywebsiteurl.com",{ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE})
doc = Nokogiri::HTML(page)
puts doc
This code works by disabling SSL. but I want it to work without disabling SSL.
when I tried without disabling SSL I got this error
SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (OpenSSL::SSL::SSLError)
when I do curl https://mywebsiteurl.com I got this result.
* Hostname was NOT found in DNS cache
* Trying xxx.xxx.xxx.xxx...
* Connected to wxxxxxxxxx.com (xxx.xxx.xxx.xxx) port 443 (#0)
* successfully set certificate verify locations:
* CAfile: none
CApath: /etc/ssl/certs
* SSLv3, TLS handshake, Client hello (1):
* SSLv3, TLS handshake, Server hello (2):
* SSLv3, TLS handshake, CERT (11):
* SSLv3, TLS alert, Server hello (2):
* SSL certificate problem: certificate has expired
* Closing connection 0
curl: (60) SSL certificate problem: certificate has expired
More details here: http://curl.haxx.se/docs/sslcerts.html
curl performs SSL certificate verification by default, using a "bundle"
of Certificate Authority (CA) public keys (CA certs). If the default
bundle file isn't adequate, you can specify an alternate file
using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
the bundle, the certificate verification probably failed due to a
problem with the certificate (it might be expired, or the name might
not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
the -k (or --insecure) option.