Build against I20150521-1100 (RC2 preview).
diff --git a/releng/build-scripts/build/test.properties.in b/releng/build-scripts/build/test.properties.in
index ad2082e..9ca07af 100644
--- a/releng/build-scripts/build/test.properties.in
+++ b/releng/build-scripts/build/test.properties.in
@@ -1,7 +1,7 @@
 # versions of test plugins:
 
 # ---- versions of test bundles compiled from an existing GIT tag: ----
-#org.eclipse.jdt.core.tests.builder=3.8.2.@SDK_QUALIFIER@
+#org.eclipse.jdt.core.tests.builder=3.10.3.@SDK_QUALIFIER@
 org.eclipse.jdt.debug.tests=3.9.0.@SDK_QUALIFIER@
 org.eclipse.jdt.ui.tests=3.10.100.@SDK_QUALIFIER@
 org.eclipse.jdt.ui.tests.refactoring=3.10.100.@SDK_QUALIFIER@