diff --git a/schach/pom.xml b/schach/pom.xml
index 7956515..8f7d095 100644
--- a/schach/pom.xml
+++ b/schach/pom.xml
@@ -15,8 +15,8 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>8</maven.compiler.source>
-    <maven.compiler.target>8</maven.compiler.target>
+    <maven.compiler.source>21</maven.compiler.source>
+    <maven.compiler.target>21</maven.compiler.target>
   </properties>
 
   <repositories>