diff --git a/pom.xml b/pom.xml
index 92c6858..501b1f2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -16,7 +16,7 @@
         <junit.version>5.10.2</junit.version>
         <piranha.version>24.3.0</piranha.version>
         <!-- other -->
-        <java.version>22</java.version>
+        <java.version>21</java.version>
         <piranha.distribution>webprofile</piranha.distribution>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <!-- plugins -->
@@ -71,6 +71,7 @@
                 <version>${maven-compiler-plugin.version}</version>
                 <configuration>
                     <release>${java.version}</release>
+                    <showDeprecation>true</showDeprecation>
                 </configuration>
             </plugin>
             <plugin>