diff --git a/updatesite/org.etsi.mts.tdl.updatesite/category.xml b/updatesite/org.etsi.mts.tdl.updatesite/category.xml
index 2234e429f9a6a45cc2f5954e444a59afc411b958..a5f78f2d1cfd98a78f3bed84009d40651728c92d 100644
--- a/updatesite/org.etsi.mts.tdl.updatesite/category.xml
+++ b/updatesite/org.etsi.mts.tdl.updatesite/category.xml
@@ -50,6 +50,7 @@
    <repository-reference location="http://t3tools.informatik.uni-goettingen.de/downloads/trex2/" name="" enabled="true" />
    <repository-reference location="https://top.etsi.org/top-extras/updatesite/stable/" name="" enabled="true" />
    <repository-reference location="https://download.eclipse.org/tools/orbit/simrel/orbit-aggregation/2025-12/" name="" enabled="true" />
+   <repository-reference location="https://download.eclipse.org/tools/orbit/simrel/orbit-aggregation/2023-09/" name="" enabled="true" />
    <repository-reference location="https://download.eclipse.org/modeling/emft/mwe/updates/releases/2.23.0/" name="" enabled="true" />
    <repository-reference location="https://download.eclipse.org/modeling/tmf/xtext/updates/releases/2.40.0/" name="" enabled="true" />
    <repository-reference location="https://download.eclipse.org/releases/2025-09" name="" enabled="true" />