diff --git a/pom.xml b/pom.xml
index 3f7cc7e3..7c12ddfd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -122,8 +122,8 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
 				<configuration>
-					<source>17</source>
-					<target>17</target>
+					<source>18</source>
+					<target>18</target>
                     <compilerArgs>--enable-preview</compilerArgs>
                 </configuration>
 			</plugin>
@@ -138,8 +138,8 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 	<properties>
 	    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-		<maven.compiler.source>17</maven.compiler.source>
-		<maven.compiler.target>17</maven.compiler.target>
+		<maven.compiler.source>18</maven.compiler.source>
+		<maven.compiler.target>18</maven.compiler.target>
 		<compilerArgs>
 			--enable-preview
 		</compilerArgs>
diff --git a/src/test/java/targetast/TestComplete.java b/src/test/java/targetast/TestComplete.java
index d0e07540..c30dfed0 100644
--- a/src/test/java/targetast/TestComplete.java
+++ b/src/test/java/targetast/TestComplete.java
@@ -349,6 +349,13 @@ public class TestComplete {
         var instance = classFiles.get("Tph3").getDeclaredConstructor().newInstance();
     }
 
+    @Test
+    public void tph4Test() throws Exception {
+        var classFiles = generateClassFiles("Tph4.jav", new ByteArrayClassLoader());
+        var tph5 = classFiles.get("Tph4");
+        var instance = tph5.getDeclaredConstructor().newInstance();
+    }
+
     @Test
     public void tph5Test() throws Exception {
         var classFiles = generateClassFiles("Tph5.jav", new ByteArrayClassLoader());