diff --git a/content/docs/glossary/xdr.mdx b/content/docs/glossary/xdr.mdx
index 2a2b73adb..a4f3e17f7 100644
--- a/content/docs/glossary/xdr.mdx
+++ b/content/docs/glossary/xdr.mdx
@@ -5,7 +5,7 @@ order:
 
 **XDR**, also known as _External Data Representation_, is used throughout the Stellar network and protocol. The ledger, transactions, results, history, and even the messages passed between computers running stellar-core are encoded using XDR.
 
-XDR is specified in [RFC 4506](http://tools.ietf.org/html/rfc4506.html) and is similar to tools like Protocol Buffers or Thrift. XDR provides a few important features:
+XDR is specified in [RFC 4506](https://datatracker.ietf.org/doc/html/rfc4506.html) and is similar to tools like Protocol Buffers or Thrift. XDR provides a few important features:
 
 - It is very compact, so it can be transmitted quickly and stored with minimal disk space.
 - Data encoded in XDR is reliably and predictably stored. Fields are always in the same order, which makes cryptographically signing and verifying XDR messages simple.