diff --git a/pom.xml b/pom.xml
index 13aa139..320c95d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>osm.surveyor</groupId>
@@ -12,9 +13,12 @@
     
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <java.version>1.8</java.version>
+    <java.version>11</java.version>
     <maven.compiler.source>${java.version}</maven.compiler.source>
     <maven.compiler.target>${java.version}</maven.compiler.target>
+    <gpg.skip>true</gpg.skip>
+    
+    <maven.javadoc.skip>true</maven.javadoc.skip>
   </properties>
     
   <repositories>
@@ -35,15 +39,17 @@
     <dependency>
       <groupId>osm.surveyor</groupId>
       <artifactId>AdjustTime</artifactId>
-      <version>5.3.3</version>
+      <version>5.3.9</version>
     </dependency>
+    
+    <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-imaging -->
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-imaging</artifactId>
-      <version>1.0-alpha1</version>
+      <version>1.0-alpha2</version>
       <type>jar</type>
     </dependency>
-    
+         
     <!-- for JUnit test -->
     <dependency>
       <groupId>org.hamcrest</groupId>
@@ -59,13 +65,6 @@
       <scope>test</scope>
       <type>jar</type>
     </dependency>
-    <dependency>
-      <groupId>org.apache.commons</groupId>
-      <artifactId>commons-compress</artifactId>
-      <version>1.14</version>
-      <scope>test</scope>
-      <type>jar</type>
-    </dependency>
   </dependencies>
   
   <build>