diff --git a/build.xml b/build.xml
index 186a608..5534efa 100644
--- a/build.xml
+++ b/build.xml
@@ -2,8 +2,8 @@
 <project basedir="." default="jar" name="openslide java">
 	<property environment="env"/>
 	<property name="debuglevel" value="source,lines,vars"/>
-	<property name="target" value="1.5"/>
-	<property name="source" value="1.5"/>
+	<property name="target" value="1.6"/>
+	<property name="source" value="1.6"/>
 	<property name="builddir" value="."/>
 	<property name="openslide.binding.version" value="UNKNOWN"/>
 	<property name="openslide.jni.path" value=""/>