The certificate used to test the OCSP verifier in the 'responder URI has no path' spec has expired; it expired on June 2. The certificate is here: 

spec/support/certificates/atlas-ocsp.crt

This results in that spec failing:

    1) Mongo::Socket::OcspVerifier responder URI has no path verifies.
    Failure/Error: verifier.verify.should be true

       expected true
             got false
     # ./spec/integration/ocsp_verifier_spec.rb:355:in `block (3 levels) in <top (required)>'
     # ./spec/support/common_shortcuts.rb:165:in `block in with_openssl_debug'