Update README.md

omise · Mar 5, 2024 · 17f7c08 · 17f7c08
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 <img alt="GitHub Actions status" src="https://github.com/omise/omise-ruby/workflows/Ruby/badge.svg">
 [![Gem](https://img.shields.io/gem/v/omise.svg?style=flat)](https://rubygems.org/gems/omise)
 
+## Security Warning
+
+**Please do NOT use Omise Ruby client versions less than 0.8.0, as they are outdated and have security vulnerabilities.**
+
+
 ## Installation
 
 Add the following to your `Gemfile` and run `bundle install` to install via [RubyGems](https://rubygems.org/gems/omise):