diff --git a/build.target b/build.target
index 8527307..598d177 100644
--- a/build.target
+++ b/build.target
@@ -9,7 +9,7 @@
         </location>
 
         <location includeAllPlatforms="false" includeConfigurePhase="true" includeMode="planner" includeSource="false" type="InstallableUnit">
-            <repository location="https://download.eclipse.org/justj/jres/20/updates/release/latest"/>
+            <repository location="https://download.eclipse.org/justj/jres/21/updates/release/latest"/>
             <unit id="org.eclipse.justj.openjdk.hotspot.jre.minimal.stripped.feature.group" version="0.0.0"/>
         </location>
 
@@ -145,5 +145,5 @@
         </location>
     </locations>
 
-    <targetJRE path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-20"/>
+    <targetJRE path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21"/>
 </target>
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 20f09c9..5557fff 100644
--- a/pom.xml
+++ b/pom.xml
@@ -244,7 +244,7 @@
 
                <!-- https://www.eclipse.org/justj/?page=documentation#products -->
                <!-- major version must match the one selected in build.target file -->
-               <executionEnvironment>org.eclipse.justj.openjdk.hotspot.jre.minimal.stripped-20</executionEnvironment>
+               <executionEnvironment>org.eclipse.justj.openjdk.hotspot.jre.minimal.stripped-21</executionEnvironment>
 
                <target>
                   <file>../build.target</file>