diff --git a/pom.xml b/pom.xml
index e8a7a4e..475638f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -27,6 +27,7 @@
 
   <properties>
     <io7m.api.previousVersion>3.0.0</io7m.api.previousVersion>
+    <io7m.java.targetJavaVersion>21</io7m.java.targetJavaVersion>
   </properties>
 
   <licenses>