doc: increased Maven build prerequisites to 3.6.3
diff --git a/README.md b/README.md
index 9f68dc4..e193212 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@
 
     mvn clean install
 
-You need Maven 3.3.9 (or higher) with Java 11 (or higher) for the build.
+You need Maven 3.6.3 (or higher) with Java 11 (or higher) for the build.
 For more instructions, please see the documentation at:
 
    <https://jackrabbit.apache.org/building-jackrabbit.html>