diff --git a/pom.xml b/pom.xml
index 1d85e4c..300787c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,22 +1,28 @@
 <?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/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.sonatype.oss</groupId>
+    <artifactId>oss-parent</artifactId>
+    <version>9</version>
+  </parent>
+
   <groupId>com.samskivert</groupId>
   <artifactId>pythagoras</artifactId>
   <packaging>jar</packaging>
   <version>1.5-SNAPSHOT</version>
+
   <name>pythagoras</name>
   <description>A portable geometry library.</description>
+
   <url>http://github.com/samskivert/pythagoras/</url>
   <issueManagement>
     <url>http://github.com/samskivert/pythagoras/issues</url>
   </issueManagement>
 
-  <parent>
-    <groupId>org.sonatype.oss</groupId>
-    <artifactId>oss-parent</artifactId>
-    <version>7</version>
-  </parent>
+  <prerequisites>
+    <maven>3.3.0</maven>
+  </prerequisites>
 
   <licenses>
     <license>
@@ -40,6 +46,11 @@
     <url>http://github.com/samskivert/pythagoras/</url>
   </scm>
 
+  <properties>
+    <source.level>1.7</source.level>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
   <dependencies>
     <dependency>
       <groupId>junit</groupId>
@@ -65,14 +76,15 @@
         </includes>
       </resource>
     </resources>
+
     <plugins>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.1</version>
+        <version>3.3</version>
         <configuration>
-          <source>1.6</source>
-          <target>1.6</target>
+          <source>${source.level}</source>
+          <target>${source.level}</target>
           <fork>true</fork>
           <showDeprecation>true</showDeprecation>
           <showWarnings>true</showWarnings>
@@ -83,10 +95,11 @@
           </compilerArgs>
         </configuration>
       </plugin>
+
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-resources-plugin</artifactId>
-        <version>2.4.3</version>
+        <version>2.7</version>
         <configuration>
           <encoding>UTF-8</encoding>
         </configuration>
@@ -94,28 +107,13 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>2.7</version>
+        <version>2.10.3</version>
         <configuration>
           <quiet>true</quiet>
           <show>public</show>
           <additionalparam>-Xdoclint:all -Xdoclint:-missing</additionalparam>
         </configuration>
       </plugin>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-jar-plugin</artifactId>
-        <version>2.3.1</version>
-      </plugin>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-install-plugin</artifactId>
-        <version>2.3.1</version>
-      </plugin>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-deploy-plugin</artifactId>
-        <version>2.5</version>
-      </plugin>
     </plugins>
   </build>
 
@@ -130,7 +128,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>1.1</version>
+            <version>1.6</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>