diff -Nru junit4-4.13.2/debian/changelog junit4-4.13.2/debian/changelog
--- junit4-4.13.2/debian/changelog	2022-10-05 09:47:38.000000000 +0000
+++ junit4-4.13.2/debian/changelog	2023-10-15 22:44:29.000000000 +0000
@@ -1,3 +1,10 @@
+junit4 (4.13.2-4) unstable; urgency=medium
+
+  * Fixed the build failure with Java 21 (Closes: #1053039)
+  * Standards-Version updated to 4.6.2
+
+ -- Emmanuel Bourg <ebourg@apache.org>  Mon, 16 Oct 2023 00:44:29 +0200
+
 junit4 (4.13.2-3) unstable; urgency=medium
 
   * Replace hamcrest-core with hamcrest in the pom dependencies
diff -Nru junit4-4.13.2/debian/control junit4-4.13.2/debian/control
--- junit4-4.13.2/debian/control	2022-10-05 09:47:21.000000000 +0000
+++ junit4-4.13.2/debian/control	2023-10-15 22:44:29.000000000 +0000
@@ -16,7 +16,7 @@
  libhamcrest-java (>= 2.2),
  libmaven-javadoc-plugin-java,
  maven-debian-helper (>= 2.2)
-Standards-Version: 4.6.1
+Standards-Version: 4.6.2
 Vcs-Git: https://salsa.debian.org/java-team/junit4.git
 Vcs-Browser: https://salsa.debian.org/java-team/junit4
 Homepage: http://www.junit.org
diff -Nru junit4-4.13.2/debian/maven.properties junit4-4.13.2/debian/maven.properties
--- junit4-4.13.2/debian/maven.properties	2021-11-21 22:28:04.000000000 +0000
+++ junit4-4.13.2/debian/maven.properties	2023-10-15 22:44:29.000000000 +0000
@@ -1 +1,2 @@
 maven.compiler.release=8
+argLine=-Djava.security.manager=allow
diff -Nru junit4-4.13.2/debian/patches/java21-compatibility.patch junit4-4.13.2/debian/patches/java21-compatibility.patch
--- junit4-4.13.2/debian/patches/java21-compatibility.patch	1970-01-01 00:00:00.000000000 +0000
+++ junit4-4.13.2/debian/patches/java21-compatibility.patch	2023-10-15 22:44:29.000000000 +0000
@@ -0,0 +1,14 @@
+Description: Fixes a test failure with Java 21 due to ThreadGroup changes
+Author: Emmanuel Bourg <ebourg@apache.org>
+Forwarded: not-needed
+--- a/src/test/java/org/junit/internal/runners/statements/FailOnTimeoutTest.java
++++ b/src/test/java/org/junit/internal/runners/statements/FailOnTimeoutTest.java
+@@ -204,8 +204,6 @@
+ 
+         assertNotNull("the Statement was never run", innerThread.get());
+         innerThread.get().join();
+-        assertTrue("the 'FailOnTimeoutGroup' thread group should be destroyed after running the test",
+-                innerThreadGroup.get().isDestroyed());
+     }
+ 
+     @Test
diff -Nru junit4-4.13.2/debian/patches/series junit4-4.13.2/debian/patches/series
--- junit4-4.13.2/debian/patches/series	2022-09-27 22:12:23.000000000 +0000
+++ junit4-4.13.2/debian/patches/series	2023-10-15 22:44:29.000000000 +0000
@@ -2,3 +2,4 @@
 Version.patch
 java17-compatibility.patch
 hamcrest-compatibility.patch
+java21-compatibility.patch