diff --git a/bundles/org.eclipse.ui.workbench/.classpath b/bundles/org.eclipse.ui.workbench/.classpath
index 71787b2a7b2..2d0d3f60a8f 100644
--- a/bundles/org.eclipse.ui.workbench/.classpath
+++ b/bundles/org.eclipse.ui.workbench/.classpath
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21"/>
 	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
 	<classpathentry kind="src" path="eclipseui"/>
 	<classpathentry kind="src" path="eclipseuieditorsupport"/>
diff --git a/bundles/org.eclipse.ui.workbench/.settings/org.eclipse.jdt.core.prefs b/bundles/org.eclipse.ui.workbench/.settings/org.eclipse.jdt.core.prefs
index cd7191299e1..993d3ecb665 100644
--- a/bundles/org.eclipse.ui.workbench/.settings/org.eclipse.jdt.core.prefs
+++ b/bundles/org.eclipse.ui.workbench/.settings/org.eclipse.jdt.core.prefs
@@ -28,9 +28,9 @@ org.eclipse.jdt.core.compiler.annotation.nullable.secondary=
 org.eclipse.jdt.core.compiler.annotation.nullanalysis=disabled
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=21
 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=17
+org.eclipse.jdt.core.compiler.compliance=21
 org.eclipse.jdt.core.compiler.debug.lineNumber=generate
 org.eclipse.jdt.core.compiler.debug.localVariable=generate
 org.eclipse.jdt.core.compiler.debug.sourceFile=generate
@@ -145,7 +145,7 @@ org.eclipse.jdt.core.compiler.problem.unusedTypeParameter=ignore
 org.eclipse.jdt.core.compiler.problem.unusedWarningToken=warning
 org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=warning
 org.eclipse.jdt.core.compiler.release=enabled
-org.eclipse.jdt.core.compiler.source=17
+org.eclipse.jdt.core.compiler.source=21
 org.eclipse.jdt.core.formatter.align_fields_grouping_blank_lines=2147483647
 org.eclipse.jdt.core.formatter.align_type_members_on_columns=false
 org.eclipse.jdt.core.formatter.alignment_for_additive_operator=16
diff --git a/bundles/org.eclipse.ui.workbench/META-INF/MANIFEST.MF b/bundles/org.eclipse.ui.workbench/META-INF/MANIFEST.MF
index e80a10825d7..8020ca47846 100644
--- a/bundles/org.eclipse.ui.workbench/META-INF/MANIFEST.MF
+++ b/bundles/org.eclipse.ui.workbench/META-INF/MANIFEST.MF
@@ -132,7 +132,7 @@ Import-Package: com.ibm.icu.util,
  org.osgi.service.event.propertytypes;version="[1.4.0,2.0.0)",
  org.w3c.dom,
  org.xml.sax
-Bundle-RequiredExecutionEnvironment: JavaSE-17
+Bundle-RequiredExecutionEnvironment: JavaSE-21
 Require-Capability: osgi.extender;
   filter:="(&(osgi.extender=osgi.component)(version>=1.2)(!(version>=2.0)))"
 Automatic-Module-Name: org.eclipse.ui.workbench