diff --git a/bundles/org.eclipse.e4.ui.workbench/.classpath b/bundles/org.eclipse.e4.ui.workbench/.classpath
index 81fe078c20c..375961e4d61 100644
--- a/bundles/org.eclipse.e4.ui.workbench/.classpath
+++ b/bundles/org.eclipse.e4.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="src"/>
 	<classpathentry kind="output" path="bin"/>
diff --git a/bundles/org.eclipse.e4.ui.workbench/.settings/org.eclipse.jdt.core.prefs b/bundles/org.eclipse.e4.ui.workbench/.settings/org.eclipse.jdt.core.prefs
index f11df476391..9a33f7701d0 100644
--- a/bundles/org.eclipse.e4.ui.workbench/.settings/org.eclipse.jdt.core.prefs
+++ b/bundles/org.eclipse.e4.ui.workbench/.settings/org.eclipse.jdt.core.prefs
@@ -24,9 +24,9 @@ org.eclipse.jdt.core.compiler.annotation.nullable=org.eclipse.jdt.annotation.Nul
 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
@@ -131,7 +131,7 @@ 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.e4.ui.workbench/META-INF/MANIFEST.MF b/bundles/org.eclipse.e4.ui.workbench/META-INF/MANIFEST.MF
index 2ea4c0a146f..2d9682f6f25 100644
--- a/bundles/org.eclipse.e4.ui.workbench/META-INF/MANIFEST.MF
+++ b/bundles/org.eclipse.e4.ui.workbench/META-INF/MANIFEST.MF
@@ -19,7 +19,7 @@ Require-Bundle: org.eclipse.e4.ui.model.workbench;bundle-version="1.2.0",
  org.eclipse.e4.core.di.extensions,
  org.eclipse.core.runtime;bundle-version="[3.29.0,4.0.0)"
 Bundle-ActivationPolicy: lazy
-Bundle-RequiredExecutionEnvironment: JavaSE-17
+Bundle-RequiredExecutionEnvironment: JavaSE-21
 Export-Package: org.eclipse.e4.ui.internal.workbench;
   x-friends:="org.eclipse.e4.ui.workbench.fragment,
    org.eclipse.e4.ui.workbench.addons.swt,