diff --git a/releases/R2025b/README.md b/releases/R2025b/README.md
index 48c3bf0..3bdae60 100644
--- a/releases/R2025b/README.md
+++ b/releases/R2025b/README.md
@@ -13,7 +13,7 @@ Then, click the appropriate **Launch Stack** button to launch the stack configur
 
 | Release | New VPC | Existing VPC | Operating Systems |
 |---------|---------| ------------ | ----------------- |
-| R2025b | <a href="https://us-east-1.console.aws.amazon.com/cloudformation/home?region=us-east-1#/stacks/quickcreate?templateURL=https://matlab-web-app-server-templates.s3.amazonaws.com/r2025b_refarch/WebAppServer_new.yml" target="_blank">     <img src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/> </a> | <a  href ="https://us-east-1.console.aws.amazon.com/cloudformation/home?region=us-east-1#/stacks/create/review?templateURL=https://matlab-web-app-server-templates.s3.amazonaws.com/r2025b_refarch/WebAppServer_existing.yml"  target ="_blank" >      <img  src ="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png" /> </a> | Windows Server 2022 or Ubuntu 22.04 VM |
+| R2025b | <a href="https://us-east-1.console.aws.amazon.com/cloudformation/home?region=us-east-1#/stacks/quickcreate?templateURL=https://matlab-web-app-server-templates.s3.amazonaws.com/r2025b_refarch/WebAppServer_new.yml" target="_blank">     <img src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/> </a> | <a  href ="https://us-east-1.console.aws.amazon.com/cloudformation/home?region=us-east-1#/stacks/create/review?templateURL=https://matlab-web-app-server-templates.s3.amazonaws.com/r2025b_refarch/WebAppServer_existing.yml"  target ="_blank" >      <img  src ="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png" /> </a> | Windows Server 2022 or Ubuntu 24.04 VM |
 
 The AWS Management Console opens in your web browser.
 
diff --git a/releases/release-notes.md b/releases/release-notes.md
index a572ae2..6e19132 100644
--- a/releases/release-notes.md
+++ b/releases/release-notes.md
@@ -2,6 +2,7 @@
 
 ### R2025b
 - You can now deploy MATLAB Web App Server R2025b using the Amazon Web Services reference architecture.
+- Starting November 7 2025, Linux servers use Ubuntu 24.04 for improved performance and security.
 
 ### R2025a
 - You can now deploy MATLAB Web App Server R2025a using the Amazon Web Services reference architecture.