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--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
 [![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
 [![.NET](https://github.com/ikpil/DotFastLZ/actions/workflows/dotnet.yml/badge.svg)](https://github.com/ikpil/DotFastLZ/actions/workflows/dotnet.yml)
+[![CodeQL](https://github.com/ikpil/DotFastLZ/actions/workflows/github-code-scanning/codeql/badge.svg)](https://github.com/ikpil/DotFastLZ/actions/workflows/github-code-scanning/codeql)
 
 ## Introduction