diff --git a/releng/CDT.setup b/releng/CDT.setup
index e62173e04ba..053fd6eb993 100644
--- a/releng/CDT.setup
+++ b/releng/CDT.setup
@@ -75,7 +75,7 @@
   <setupTask
       xsi:type="setup:VariableTask"
       name="eclipse.target.platform"
-      defaultValue="2021-03"
+      defaultValue="2021-09"
       storageURI="scope://Workspace"/>
   <setupTask
       xsi:type="setup.targlets:TargletTask"
@@ -166,15 +166,15 @@
       <repositoryList
           name="CDT Latest Released">
         <repository
-            url="https://download.eclipse.org/eclipse/updates/4.22-I-builds/I20211023-1800/"/>
+            url="https://download.eclipse.org/eclipse/updates/4.21/R-4.21-202109060500/"/>
         <repository
             url="https://download.eclipse.org/egit/updates"/>
         <repository
-            url="https://download.eclipse.org/linuxtools/updates-docker-nightly/"/>
+            url="https://download.eclipse.org/linuxtools/update-docker-5.4.0/"/>
         <repository
             url="https://download.eclipse.org/lsp4e/releases/0.19.0/"/>
         <repository
-            url="https://download.eclipse.org/modeling/emf/emf/builds/release/latest/"/>
+            url="https://download.eclipse.org/modeling/emf/emf/builds/release/2.25/"/>
         <repository
             url="https://download.eclipse.org/mylyn/docs/releases/3.0.40/"/>
         <repository
@@ -194,7 +194,7 @@
           </annotation>
         </repository>
         <repository
-            url="https://download.eclipse.org/tools/orbit/downloads/drops/S20211020204107/repository"/>
+            url="https://download.eclipse.org/tools/orbit/downloads/2021-09/"/>
         <repository
             url="https://download.eclipse.org/tools/ptp/builds/remote/3.0/2021-09/"/>
       </repositoryList>
@@ -309,11 +309,11 @@
             rootFolder="${git.clone.cdt.location}"
             locateNestedProjects="true"/>
         <repositoryList
-            name="2021-03">
+            name="2021-09">
           <repository
               url="https://download.eclipse.org/cbi/updates/license/"/>
           <repository
-              url="https://download.eclipse.org/eclipse/updates/4.19/R-4.19-202103031800/"/>
+              url="https://download.eclipse.org/eclipse/updates/4.21/R-4.21-202109060500/"/>
           <repository
               url="https://download.eclipse.org/egit/updates/"/>
           <repository
@@ -321,11 +321,11 @@
           <repository
               url="https://download.eclipse.org/wildwebdeveloper/snapshots/"/>
           <repository
-              url="https://download.eclipse.org/lsp4e/releases/0.18.0/"/>
+              url="https://download.eclipse.org/lsp4e/releases/0.19.0/"/>
           <repository
               url="https://download.eclipse.org/modeling/emf/emf/builds/release/latest/"/>
           <repository
-              url="https://download.eclipse.org/mylyn/docs/releases/3.0.38/"/>
+              url="https://download.eclipse.org/mylyn/docs/releases/3.0.40/"/>
           <repository
               url="http://download.eclipse.org/mylyn/drops/3.25.2/v20200831-1956"/>
           <repository
@@ -342,9 +342,9 @@
             </annotation>
           </repository>
           <repository
-              url="https://download.eclipse.org/tools/orbit/downloads/drops/R20210223232630/repository/"/>
+              url="https://download.eclipse.org/tools/orbit/downloads/2021-09/"/>
           <repository
-              url="https://download.eclipse.org/tools/ptp/remote/releases/3.0/remote-3.0.1/"/>
+              url="https://download.eclipse.org/tools/ptp/builds/remote/3.0/2021-09"/>
         </repositoryList>
       </targlet>
     </setupTask>