diff --git a/.travis.yml b/.travis.yml
index 593f8e14..9a656f81 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,5 @@
+# openjdk-6-jdk is not available in more recent Ubuntu versions
+dist: trusty
language: java
install:
# Download dependencies with JDK 8 because Maven Central supports
@@ -23,4 +25,10 @@ jdk:
- oraclejdk9
- oraclejdk8
- openjdk7
- - openjdk6
+
+# The jdk key does not work for openjdk6 in Travis CI any more, so
+# we manually install openjdk-6-jdk and set JAVA_HOME appropriately
+# (https://github.com/travis-ci/travis-ci/issues/9713)
+matrix:
+ include:
+ - env: JAVA_HOME=/usr/lib/jvm/java-6-openjdk-amd64
diff --git a/pom.xml b/pom.xml
index 09e4727a..58c2fe96 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
com.github.stefanbirkner
lib-parent
- 8
+ 14
system-rules