diff --git a/common/pom.xml b/common/pom.xml
index 083ddae..90ea758 100644
--- a/common/pom.xml
+++ b/common/pom.xml
@@ -12,8 +12,8 @@
     <artifactId>powerlib-common</artifactId>
 
     <properties>
-        <maven.compiler.source>${java.version}</maven.compiler.source>
-        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <maven.compiler.source>9</maven.compiler.source>
+        <maven.compiler.target>9</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>