diff --git a/tycho-apitools-plugin/src/main/java/org/eclipse/tycho/apitools/ApiAnalysisMojo.java b/tycho-apitools-plugin/src/main/java/org/eclipse/tycho/apitools/ApiAnalysisMojo.java
index e172c9e81a..97fe9b4a95 100644
--- a/tycho-apitools-plugin/src/main/java/org/eclipse/tycho/apitools/ApiAnalysisMojo.java
+++ b/tycho-apitools-plugin/src/main/java/org/eclipse/tycho/apitools/ApiAnalysisMojo.java
@@ -77,7 +77,7 @@ public class ApiAnalysisMojo extends AbstractMojo {
 
 	static final String BUNDLE_CORE = "org.eclipse.core.runtime";
 
-	private static final String REPO_DEFAULT = "https://download.eclipse.org/releases/2023-06/";
+	private static final String REPO_DEFAULT = "https://download.eclipse.org/releases/2023-09/";
 
 	@Parameter(property = "plugin.artifacts")
 	protected List<Artifact> pluginArtifacts;
diff --git a/tycho-extras/tycho-document-bundle-plugin/src/main/java/org/eclipse/tycho/extras/docbundle/DocApplicationManager.java b/tycho-extras/tycho-document-bundle-plugin/src/main/java/org/eclipse/tycho/extras/docbundle/DocApplicationManager.java
index c9b77bddd2..19ed66ad75 100644
--- a/tycho-extras/tycho-document-bundle-plugin/src/main/java/org/eclipse/tycho/extras/docbundle/DocApplicationManager.java
+++ b/tycho-extras/tycho-document-bundle-plugin/src/main/java/org/eclipse/tycho/extras/docbundle/DocApplicationManager.java
@@ -25,7 +25,7 @@
 
 @Component(role = DocApplicationManager.class)
 public class DocApplicationManager {
-	private static final String REPO_DEFAULT = "https://download.eclipse.org/releases/2023-03/";
+	private static final String REPO_DEFAULT = "https://download.eclipse.org/releases/2023-09/";
 
 	static MavenRepositoryLocation getRepository(Repository location) {
 		if (location == null) {
diff --git a/tycho-its/projects/api-tools/pom.xml b/tycho-its/projects/api-tools/pom.xml
index 71c9c3b6f1..f1230b7f92 100644
--- a/tycho-its/projects/api-tools/pom.xml
+++ b/tycho-its/projects/api-tools/pom.xml
@@ -12,7 +12,7 @@
 		<module>bundle2</module>
 	</modules>
 	<properties>
-		<target-platform>https://download.eclipse.org/releases/2023-06/</target-platform>
+		<target-platform>https://download.eclipse.org/releases/2023-09/</target-platform>
 	</properties>
 	<repositories>
 		<repository>
diff --git a/tycho-its/projects/document-bundle-plugin/build-help-index/pom.xml b/tycho-its/projects/document-bundle-plugin/build-help-index/pom.xml
index 6723c553fc..202f5c4f85 100644
--- a/tycho-its/projects/document-bundle-plugin/build-help-index/pom.xml
+++ b/tycho-its/projects/document-bundle-plugin/build-help-index/pom.xml
@@ -6,7 +6,7 @@
 	<version>1.0.0-SNAPSHOT</version>
 	<packaging>eclipse-plugin</packaging>
 	<properties>
-		<target-platform>https://download.eclipse.org/releases/2023-03/</target-platform>
+		<target-platform>https://download.eclipse.org/releases/2023-09/</target-platform>
 		<tycho-version>4.0.0-SNAPSHOT</tycho-version>
 	</properties>
 	<repositories>
diff --git a/tycho-testing-harness/src/main/java/org/eclipse/tycho/test/util/EnvironmentUtil.java b/tycho-testing-harness/src/main/java/org/eclipse/tycho/test/util/EnvironmentUtil.java
index cdd7d7bc6c..68fbb9fe16 100644
--- a/tycho-testing-harness/src/main/java/org/eclipse/tycho/test/util/EnvironmentUtil.java
+++ b/tycho-testing-harness/src/main/java/org/eclipse/tycho/test/util/EnvironmentUtil.java
@@ -36,7 +36,7 @@ public class EnvironmentUtil {
 
     private static final String MAVEN_HOME_INFO = "Maven home:";
 
-    public static final String ECLIPSE_LATEST = "https:////download.eclipse.org/releases/2022-12/";
+    public static final String ECLIPSE_LATEST = "https:////download.eclipse.org/releases/2023-09/";
 
     private static final Properties props;