diff --git a/ui/org.eclipse.pde.ui.tests/.classpath b/ui/org.eclipse.pde.ui.tests/.classpath
index 675a5e2962..1aa9eca95a 100644
--- a/ui/org.eclipse.pde.ui.tests/.classpath
+++ b/ui/org.eclipse.pde.ui.tests/.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">
 		<attributes>
diff --git a/ui/org.eclipse.pde.ui.tests/.settings/org.eclipse.jdt.core.prefs b/ui/org.eclipse.pde.ui.tests/.settings/org.eclipse.jdt.core.prefs
index 3ec081faa6..f2f46bcefb 100644
--- a/ui/org.eclipse.pde.ui.tests/.settings/org.eclipse.jdt.core.prefs
+++ b/ui/org.eclipse.pde.ui.tests/.settings/org.eclipse.jdt.core.prefs
@@ -18,9 +18,9 @@ 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
@@ -135,7 +135,7 @@ 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_type_members_on_columns=false
 org.eclipse.jdt.core.formatter.alignment_for_additive_operator=16
 org.eclipse.jdt.core.formatter.alignment_for_arguments_in_allocation_expression=16
diff --git a/ui/org.eclipse.pde.ui.tests/META-INF/MANIFEST.MF b/ui/org.eclipse.pde.ui.tests/META-INF/MANIFEST.MF
index 101de69cdb..7a6f915387 100644
--- a/ui/org.eclipse.pde.ui.tests/META-INF/MANIFEST.MF
+++ b/ui/org.eclipse.pde.ui.tests/META-INF/MANIFEST.MF
@@ -67,7 +67,7 @@ Import-Package: jakarta.annotation;version="[2.1.0,3.0.0)",
  org.mockito,
  org.mockito.stubbing,
  org.osgi.service.event;version="[1.3.0,2.0.0)"
-Bundle-RequiredExecutionEnvironment: JavaSE-17
+Bundle-RequiredExecutionEnvironment: JavaSE-21
 Eclipse-BundleShape: dir
 Automatic-Module-Name: org.eclipse.pde.ui.tests
 Bundle-ActivationPolicy: lazy