diff --git a/README.md b/README.md
index 14b521d..5b1d473 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ Join my free [AlgoMaster Newsletter](https://bit.ly/amghsd) and get a **FREE Sys
 - [Distributed Caching](https://blog.algomaster.io/p/distributed-caching)
 - [Load Balancing](https://blog.algomaster.io/p/load-balancing-algorithms-explained-with-code)
 - [Databases Types](https://blog.algomaster.io/p/15-types-of-databases)
-- [SQL vs NoSQL](https://blog.algomaster.io/p/5310f615-f6cc-46f4-8890-09fc82a04b7e)
+- [SQL vs NoSQL](https://blog.algomaster.io/p/sql-vs-nosql-7-key-differences)
 - [Database Indexes](https://blog.algomaster.io/p/a-detailed-guide-on-database-indexes)
 - [Consistency Patterns](https://systemdesign.one/consistency-patterns/)
 - [HeartBeats](https://blog.algomaster.io/p/heartbeats-in-distributed-systems)
@@ -42,7 +42,7 @@ Join my free [AlgoMaster Newsletter](https://bit.ly/amghsd) and get a **FREE Sys
 - [Data Redundancy](https://blog.algomaster.io/p/489440f1-9c80-4241-9ec8-de156964c3b9)
 - [Database Sharding](https://blog.algomaster.io/p/what-is-database-sharding)
 - [Database Architectures](https://www.mongodb.com/developer/products/mongodb/active-active-application-architectures/)
-- [Failover](https://avinetworks.com/glossary/failover/)
+- [Failover](https://www.druva.com/glossary/what-is-a-failover-definition-and-related-faqs)
 - [Message Queues](https://blog.algomaster.io/p/message-queues)
 - [Checksums](https://blog.algomaster.io/p/what-are-checksums)
 - [WebSockets](https://blog.algomaster.io/p/websockets)