diff --git a/site.mk b/site.mk
index f3ae4ed..301cde8 100644
--- a/site.mk
+++ b/site.mk
@@ -23,7 +23,7 @@ GLUON_SITE_PACKAGES := \
 	firewall \
 	haveged
 
-DEFAULT_GLUON_RELEASE := 0.3.102-nightly$(shell date '+%Y%m%d')
+DEFAULT_GLUON_RELEASE := 0.5~testing4-nightly$(shell date '+%Y%m%d')
 DEFAULT_GLUON_PRIORITY := 0
 
 # Allow overriding the release number from the command line