diff --git a/pom.xml b/pom.xml
index fe53682..82c44b3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -59,7 +59,7 @@
         <!--plugin versions -->
         <javacc.maven.plugin.version>2.6</javacc.maven.plugin.version>
         <maven.assembly.plugin.version>3.3.0</maven.assembly.plugin.version>
-        <maven.compiler.plugin.version>3.8.1</maven.compiler.plugin.version>
+        <maven.compiler.plugin.version>3.9.0</maven.compiler.plugin.version>
         <maven.jar.plugin.version>3.2.2</maven.jar.plugin.version>
         <spotbugs.maven.plugin.version>3.1.3</spotbugs.maven.plugin.version>
         <maven.checkstyle.plugin.version>3.1.2</maven.checkstyle.plugin.version>