diff --git a/build.properties b/build.properties
index d1de84034d..20f6c5024b 100644
--- a/build.properties
+++ b/build.properties
@@ -36,9 +36,9 @@
 
 name: rhino
 Name: Rhino
-version: 1_6R4
+version: 1_6R5
 # See Context#getImplementationVersion() for format of this!
-implementation.version: Rhino 1.6 release 4 ${implementation.date}
+implementation.version: Rhino 1.6 release 5 ${implementation.date}
 
 build.dir: build
 rhino.jar: js.jar