diff --git a/.travis.yml b/.travis.yml
index 18fc113f2..89c29645d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: java
 matrix:
   include:
-    - jdk: oraclejdk8
+    - jdk: oraclejdk9
 
 script: >-
     ./gradlew test asciidoctor
@@ -16,4 +16,4 @@ deploy:
 addons:
   apt:
     packages:
-      - oracle-java8-installer
+      - oracle-java9-installer
diff --git a/build.gradle b/build.gradle
index 130b8681b..0a4290207 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,8 +9,8 @@ plugins {
     id 'org.asciidoctor.convert' version '1.5.6'
 }
 
-sourceCompatibility = JavaVersion.VERSION_1_8
-targetCompatibility = JavaVersion.VERSION_1_8
+sourceCompatibility = JavaVersion.VERSION_1_9
+targetCompatibility = JavaVersion.VERSION_1_9
 
 repositories {
     mavenCentral()
@@ -33,6 +33,11 @@ sourceSets {
 }
 
 dependencies {
+    implementation group: 'javax.xml.bind', name: 'jaxb-api', version: '2.2.8'
+    implementation group: 'com.sun.xml.bind', name: 'jaxb-impl', version: '2.3.0'
+    implementation group: 'com.sun.xml.bind', name: 'jaxb-core', version: '2.3.0'
+    implementation group: 'javax.activation', name: 'activation', version: '1.1.1'
+
     testImplementation group: 'junit', name: 'junit', version: '4.12'
 }
 
diff --git a/docs/DeveloperGuide.adoc b/docs/DeveloperGuide.adoc
index 291c4fde9..77d72a459 100644
--- a/docs/DeveloperGuide.adoc
+++ b/docs/DeveloperGuide.adoc
@@ -9,7 +9,7 @@
 
 === Prerequisites
 
-* JDK 8 or later
+* JDK 9 or later
 * IntelliJ IDE
 
 === Importing the project into IntelliJ
@@ -17,8 +17,8 @@
 . Open IntelliJ (if you are not in the welcome screen, click `File` > `Close Project` to close the existing project dialog first)
 . Set up the correct JDK version
 .. Click `Configure` > `Project Defaults` > `Project Structure`
-.. If JDK 8 is listed in the drop down, select it. If it is not, click `New...` and select the directory where you installed JDK 8.
-.. Click `OK`.
+.. If JDK 9 is listed in the drop down, select it. If it is not, click `New...` and select the directory where you installed JDK 9
+.. Click `OK`
 . Click `Import Project`
 . Locate the `build.gradle` file and select it. Click `OK`
 . Click `Open as Project`
@@ -80,7 +80,7 @@ Use case resumes at step 2.
 [appendix]
 == Non Functional Requirements
 
-. Should work on any <<mainstream-os, mainstream OS>> as long as it has Java 8 or higher installed.
+. Should work on any <<mainstream-os, mainstream OS>> as long as it has Java 9 or higher installed.
 . Should be able to hold up to 1000 persons.
 . Should come with automated unit tests and open source code.
 . Should favor DOS style commands over Unix-style commands.
diff --git a/test/java/seedu/addressbook/common/UtilsTest.java b/test/java/seedu/addressbook/common/UtilsTest.java
index 82d57e126..9d14530b7 100644
--- a/test/java/seedu/addressbook/common/UtilsTest.java
+++ b/test/java/seedu/addressbook/common/UtilsTest.java
@@ -56,8 +56,8 @@ public void elementsAreUnique() throws Exception {
         assertNotUnique("abc", "abc");
         assertNotUnique("abc", "", "abc", "ABC");
         assertNotUnique("", "abc", "a", "abc");
-        assertNotUnique(1, new Integer(1));
-        assertNotUnique(null, 1, new Integer(1));
+        assertNotUnique(1, Integer.valueOf(1));
+        assertNotUnique(null, 1, Integer.valueOf(1));
         assertNotUnique(null, null);
         assertNotUnique(null, "a", "b", null);
     }