update minimum Maven version to 3.1.0
diff --git a/pom.xml b/pom.xml
index 3893037..bb06b6f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -64,7 +64,7 @@
   <properties>
     <mavenArchiverVersion>3.5.0</mavenArchiverVersion>
     <mavenFilteringVersion>3.1.1</mavenFilteringVersion>
-    <mavenVersion>3.0</mavenVersion>
+    <mavenVersion>3.1.0</mavenVersion>
     <javaVersion>7</javaVersion>
     <project.build.outputTimestamp>2020-07-10T06:09:38Z</project.build.outputTimestamp>
   </properties>
@@ -120,11 +120,6 @@
       <artifactId>maven-shared-utils</artifactId>
       <version>3.2.1</version>
     </dependency>
-    <dependency>
-      <groupId>org.sonatype.sisu</groupId>
-      <artifactId>sisu-inject-plexus</artifactId>
-      <version>1.4.2</version>
-    </dependency>
     
     <dependency>
       <groupId>commons-io</groupId>
@@ -146,19 +141,27 @@
       <artifactId>plexus-utils</artifactId>
       <version>3.3.0</version>
     </dependency>
-
     <dependency>
       <groupId>org.apache.maven.shared</groupId>
       <artifactId>maven-filtering</artifactId>
       <version>${mavenFilteringVersion}</version>
     </dependency>
-
     <dependency>
       <groupId>org.apache.maven.shared</groupId>
       <artifactId>maven-mapping</artifactId>
       <version>3.0.0</version>
     </dependency>
-
+    <dependency>
+      <groupId>org.eclipse.aether</groupId>
+      <artifactId>aether-api</artifactId>
+      <version>0.9.0.M2</version>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.sisu</groupId>
+      <artifactId>org.eclipse.sisu.plexus</artifactId>
+      <version>0.0.0.M2a</version>
+    </dependency>
+    
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-compat</artifactId>
@@ -172,15 +175,9 @@
       <scope>test</scope>
     </dependency>
     <dependency>
-      <groupId>org.sonatype.aether</groupId>
-      <artifactId>aether-api</artifactId>
-      <version>1.7</version>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
       <groupId>org.apache.maven.plugin-testing</groupId>
       <artifactId>maven-plugin-testing-harness</artifactId>
-      <version>2.1</version>
+      <version>3.1.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
diff --git a/src/test/java/org/apache/maven/plugins/war/AbstractWarMojoTest.java b/src/test/java/org/apache/maven/plugins/war/AbstractWarMojoTest.java
index 46403f7..c6c75bf 100644
--- a/src/test/java/org/apache/maven/plugins/war/AbstractWarMojoTest.java
+++ b/src/test/java/org/apache/maven/plugins/war/AbstractWarMojoTest.java
@@ -37,7 +37,7 @@
 import org.codehaus.plexus.archiver.ArchiverException;
 import org.codehaus.plexus.archiver.jar.JarArchiver;
 import org.codehaus.plexus.util.FileUtils;
-import org.sonatype.aether.RepositorySystemSession;
+import org.eclipse.aether.RepositorySystemSession;
 
 public abstract class AbstractWarMojoTest
     extends AbstractMojoTestCase