diff --git a/README-jp.md b/README-jp.md
index 3900257..1681d9b 100644
--- a/README-jp.md
+++ b/README-jp.md
@@ -571,6 +571,7 @@ If you enjoy this awesome list and would like to support it, check out my [Patre
 - [malware-jail](https://github.com/HynekPetrak/malware-jail) - Sandbox for semi-automatic Javascript malware analysis, deobfuscation and payload extraction by [@HynekPetrak](https://github.com/HynekPetrak).
 - [repo-supervisor](https://github.com/auth0/repo-supervisor) - Scan your code for security misconfiguration, search for passwords and secrets.
 - [bXSS](https://github.com/LewisArdern/bXSS) - bXSS is a simple Blind XSS application adapted from [cure53.de/m](https://cure53.de/m) by [@LewisArdern](https://github.com/LewisArdern).
+- [GuardRails](https://github.com/apps/guardrails) - A GitHub App that provides security feedback in Pull Requests.
 
 <a name="tools-preventing"></a>
 ### Preventing
diff --git a/README-zh.md b/README-zh.md
index a2eba12..5677594 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -609,6 +609,7 @@ If you enjoy this awesome list and would like to support it, check out my [Patre
 - [repo-supervisor](https://github.com/auth0/repo-supervisor) - Scan your code for security misconfiguration, search for passwords and secrets.
 - [bXSS](https://github.com/LewisArdern/bXSS) - bXSS is a simple Blind XSS application adapted from [cure53.de/m](https://cure53.de/m) by [@LewisArdern](https://github.com/LewisArdern).
 - [重大漏洞在线检测系统](http://0day.websaas.com.cn/) - 重大漏洞在线检测系统 by [杭州安恒信息技术有限公司](http://www.dbappsecurity.com.cn/).
+- [GuardRails](https://github.com/apps/guardrails) - A GitHub App that provides security feedback in Pull Requests.
 
 <a name="tools-preventing"></a>
 ### Preventing
diff --git a/README.md b/README.md
index 9f9995a..f41394e 100644
--- a/README.md
+++ b/README.md
@@ -566,6 +566,7 @@ If you enjoy this awesome list and would like to support it, check out my [Patre
 - [repo-supervisor](https://github.com/auth0/repo-supervisor) - Scan your code for security misconfiguration, search for passwords and secrets.
 - [bXSS](https://github.com/LewisArdern/bXSS) - bXSS is a simple Blind XSS application adapted from [cure53.de/m](https://cure53.de/m) by [@LewisArdern](https://github.com/LewisArdern).
 - [OpenRASP](https://github.com/baidu/openrasp) - An open source RASP solution actively maintained by Baidu Inc. With context-aware detection algorithm the project achieved nearly no false positives. And less than 3% performance reduction is observed under heavy server load.
+- [GuardRails](https://github.com/apps/guardrails) - A GitHub App that provides security feedback in Pull Requests.
 
 <a name="tools-preventing"></a>
 ### Preventing