diff --git a/README.md b/README.md
index e497f55..7a94ce4 100644
--- a/README.md
+++ b/README.md
@@ -208,12 +208,12 @@ An updated and organized reading list for illustrating the patterns of scalable,
 	* [Unicorn: Remediation System at eBay](https://www.ebayinc.com/stories/blogs/tech/unicorn-rheos-remediation-center/)
 	* [M3: Metrics and Monitoring Platform at Uber](https://eng.uber.com/optimizing-m3/)
 	* [Athena: Automated Build Health Management System at Dropbox](https://dropbox.tech/infrastructure/athena-our-automated-build-health-management-system)
-	* [Vortex: Monitoring Server Applications at Dropbox](https://blogs.dropbox.com/tech/2019/11/monitoring-server-applications-with-vortex/)	
+	* [Vortex: Monitoring Server Applications at Dropbox](https://dropbox.tech/infrastructure/monitoring-server-applications-with-vortex)
 	* [Nuage: Cloud Management Service at LinkedIn](https://engineering.linkedin.com/blog/2019/solving-manageability-challenges-with-nuage)
 	* [Telltale: Application Monitoring at Netflix](https://netflixtechblog.com/telltale-netflix-application-monitoring-simplified-5c08bfa780ba)
 	* [ThirdEye: Monitoring Platform at LinkedIn](https://engineering.linkedin.com/blog/2019/06/smart-alerts-in-thirdeye--linkedins-real-time-monitoring-platfor)
 	* [Periskop: Exception Monitoring Service at SoundCloud](https://developers.soundcloud.com/blog/periskop-exception-monitoring-service)
-    * [Securitybot: Distributed Alerting Bot at Dropbox](https://blogs.dropbox.com/tech/2017/02/meet-securitybot-open-sourcing-automated-security-at-scale/)	
+    * [Securitybot: Distributed Alerting Bot at Dropbox](https://dropbox.tech/security/meet-securitybot-open-sourcing-automated-security-at-scale)
     * [Monitoring System at Alibaba](https://www.usenix.org/conference/srecon18asia/presentation/xinchi)
     * [Real User Monitoring at Dailymotion](https://medium.com/dailymotion/real-user-monitoring-1948375f8be5)
     * [Alerting Ecosystem at Uber](https://eng.uber.com/observability-at-scale/)