Securing Argo CD starts with proper authentication and access control. Enable single sign-on (SSO) using OIDC or LDAP for centralized user management. Apply RBAC policies to restrict permissions so that only authorized users can deploy or edit configurations. Always use HTTPS to secure communication, and avoid exposing Argo CD’s API publicly. Additionally, integrate secret management tools like HashiCorp Vault or Kubernetes Secrets for sensitive data. Keeping Argo CD and Kubernetes up to date ensures that known vulnerabilities are patched. Together, these measures create a strong security posture for production deployments.