SSL Certificate Verification Issue when Using `pip install`

What will you learn?

In this tutorial, you will delve into resolving the common error “SSL certificate verify failed: self-signed certificate in certificate chain” encountered during a pip install command. By understanding the underlying issue and implementing appropriate solutions, you will gain insights into managing SSL certification challenges effectively.

Introduction to the Problem and Solution

Encountering the error message “SSL certificate verify failed: self-signed certificate in certificate chain” while executing a pip install command signifies an SSL certification validation problem. This issue arises when installing a package from a source that employs a self-signed SSL certificate, which Python does not inherently trust.

To overcome this hurdle, it is essential to instruct Python to trust the self-signed SSL certificates or bypass the verification process entirely. This can be achieved by setting specific environment variables or utilizing particular flags during the installation procedure.


# To trust self-signed certificates temporarily:
pip install --trusted-host --trusted-host <package_name>

# To disable SSL verification (not recommended for security reasons):
pip install --index-url= --extra-index-url= <package_name>

# Copyright PHD

Note: Ensure to replace <package_name> with the actual name of the package being installed.



Here’s how you can tackle the SSL certification issue effectively:

  • Trusting Self-Signed Certificates: Utilize the –trusted-host flag to specify which hosts’ certificates should be trusted during installation.
  • Disabling SSL Verification: While feasible by modifying index URLs, disabling SSL verification poses security risks due to potential vulnerabilities like man-in-the-middle attacks.

Understanding these options empowers you to make informed decisions based on your specific requirements and security considerations.

    1. How does trusting hosts aid in resolving SSL issues? Trusting hosts enables Python to validate SSL certificates from specified hosts without encountering errors related to untrusted sources.

    2. Is disabling SSL verification recommended in all scenarios? No, disabling SSL verification should only be considered as a last resort due to significant security risks associated with bypassing encryption checks.

    3. Can I permanently trust self-signed certificates instead of specifying them each time? Yes, configuring Python’s ssl module settings or adding custom CA certificates programmatically offers long-term solutions over relying on temporary flags during installations.

    4. Are there alternative methods besides changing environment variables or flags? Utilizing tools like the certifi library or configuring system-level CA certificates provides robust solutions for managing SSL certifications across multiple applications within your environment.

    5. How do I identify if an SSL-related error pertains specifically to self-signed certificates in the chain? The presence of “self-signed certificate in certificate chain” in the error message typically indicates that one of the intermediate certificates used is unrecognized by Python’s default trusted CAs list.

    6. Can I update Python’s CA store manually? Yes, updating CA bundles from reputable sources and overriding existing ones within your Python installation directory enhances compatibility with secure connections.

    7. Will trusting additional hosts impact my system’s overall security posture? Trusting additional hosts increases exposure surface, potentially leading to exploitation if malicious actors compromise those sources; hence limit trusting verified entities essential for operations.

    8. What steps should I take if updating CA bundles doesn’t resolve my certification validation problems? Review network configurations ensuring no proxy tampering intercepts connections causing unexpected TLS failures then consult relevant support channels provided per service exhibiting such errors beyond local modifications scope.

    9. Can unexpected changes in server-side configurations contribute towards triggering these types of errors? Certainly! Improperly configured servers may inadvertently introduce misaligned cryptographic materials disrupting handshake procedures necessitating reevaluation of setup adherence against standard practices promoting proper connectivity establishment between client-server endpoints.


Navigating through SSL certification challenges such as “SSL certificate verify failed: self-signed certificate in a chain” demands a careful balance between convenience and security considerations. By comprehending how Python handles certifications and implementing suitable measures according to our needs, we ensure seamless installations without compromising data integrity or exposing vulnerable points within systems.

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