diff --git a/tests/0_common/20_upgrade_all.sh b/tests/0_common/20_upgrade_all.sh
index d15a082..d379a7a 100755
--- a/tests/0_common/20_upgrade_all.sh
+++ b/tests/0_common/20_upgrade_all.sh
@@ -2,6 +2,7 @@
 
 t_Log "Running $0 - test that all updates can be applied to this machine cleanly"
 
+yum -d0 -y install deltarpm
 yum -d0 -y upgrade
 
 t_Log "Running $0 - listing all used/available packages"