diff --git a/pom.xml b/pom.xml
index e49396e5db3..c85aee676da 100644
--- a/pom.xml
+++ b/pom.xml
@@ -43,7 +43,7 @@
 
 		<!-- When changing this value, consider also bumping the version numbers of all the docs plug-ins so that compare&replace does not
 		     replace the the newly built docs because the only change is in the filtered out index/* resources. -->
-		<help-docs-eclipserun-repo>http://download.eclipse.org/eclipse/updates/4.21/</help-docs-eclipserun-repo>
+		<help-docs-eclipserun-repo>http://download.eclipse.org/eclipse/updates/4.21/R-4.21-202109060500/</help-docs-eclipserun-repo>
 
 		<tycho.scmUrl>scm:git:https://git.eclipse.org/r/cdt/org.eclipse.cdt</tycho.scmUrl>
 		<base.test.vmargs>-Xms256m -Xmx512m -ea</base.test.vmargs>