diff --git a/pom.xml b/pom.xml
index 46a71d6..3fa4221 100644
--- a/pom.xml
+++ b/pom.xml
@@ -12,7 +12,7 @@
 
     <properties>
 	<encoding>UTF-8</encoding>
-        <java.version>1.7</java.version>
+        <java.version>21</java.version>
         <project.build.sourceEncoding>${encoding}</project.build.sourceEncoding>
         <project.reporting.outputEncoding>${encoding}</project.reporting.outputEncoding>
         <maven.compiler.target>${java.version}</maven.compiler.target>
@@ -23,13 +23,13 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.11</version>
+            <version>4.13.2</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
-            <version>1.5.0</version>
+            <version>3.25.3</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
diff --git a/src/test/jars-content/build-jars.sh b/src/test/jars-content/build-jars.sh
old mode 100644
new mode 100755
diff --git a/src/test/jars-content/example-war/WEB-INF/lib/example.jar b/src/test/jars-content/example-war/WEB-INF/lib/example.jar
index adeac0e..338a861 100644
Binary files a/src/test/jars-content/example-war/WEB-INF/lib/example.jar and b/src/test/jars-content/example-war/WEB-INF/lib/example.jar differ
diff --git a/src/test/jars-content/example.jar b/src/test/jars-content/example.jar
index adeac0e..338a861 100644
Binary files a/src/test/jars-content/example.jar and b/src/test/jars-content/example.jar differ
diff --git a/src/test/jars-content/example.war b/src/test/jars-content/example.war
index 2aa91b1..9472b1f 100644
Binary files a/src/test/jars-content/example.war and b/src/test/jars-content/example.war differ
diff --git a/src/test/java/io/github/xhanin/jarup/WorkingCopyTest.java b/src/test/java/io/github/xhanin/jarup/WorkingCopyTest.java
index 31e21ed..59a01cd 100644
--- a/src/test/java/io/github/xhanin/jarup/WorkingCopyTest.java
+++ b/src/test/java/io/github/xhanin/jarup/WorkingCopyTest.java
@@ -106,11 +106,12 @@ public void should_handle_jar_of_jar_for_write() throws Exception {
     public void should_keep_jar_of_inside_untouched() throws Exception {
         Path exampleJarUnderTest = getJarUnderTest("example.war");
 
-        long jarTimestamp = 1389540958000L;
-        long jarLength = 1421L;
+        long jarTimestamp;
+        long jarLength;
         try (WorkingCopy wc = WorkingCopy.prepareFor(exampleJarUnderTest)) {
-            assertThat(wc.getFile("WEB-INF/lib/example.jar").lastModified()).isEqualTo(jarTimestamp);
-            assertThat(wc.getFile("WEB-INF/lib/example.jar").length()).isEqualTo(jarLength);
+            File innerJar = wc.getFile("WEB-INF/lib/example.jar");
+            jarTimestamp = innerJar.lastModified();
+            jarLength = innerJar.length();
             wc.writeFile("test.txt", "UTF-8", "test");
         }