diff --git a/.travis.yml b/.travis.yml
index 5de87b9d..44d535e0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,10 +5,21 @@ secure: "H4tUL1Greyj588Kb1/FnRapFT/57KaApQYAZx2KRORkddYSzPq2tovI1S8AnqzCHpVtfjin
 
 language: java
 
-jdk:
-  - oraclejdk8
-  - oraclejdk7
-  - openjdk7
+
+matrix:
+  include:
+    - os: linux
+      dist: trusty
+      jdk: oraclejdk8
+    - os: linux
+      dist: trusty
+      jdk: oraclejdk9
+    - os: linux
+      dist: precise
+      jdk: oraclejdk7
+    - os: linux
+      dist: precise
+      jdk: openjdk7
 
 install:
   - mvn install -DskipTests=true -Dgpg.skip=true