diff --git a/deploy/install.sh b/deploy/install.sh
index 941fe83..44b34fc 100755
--- a/deploy/install.sh
+++ b/deploy/install.sh
@@ -22,7 +22,7 @@ ROLE="${1:-}"
 VENV="${2:-$PWD/ve.demo}"
 
 REPO="https://github.com/radical-cybertools/digital.twins"
-REF="3f828bca3c0ad7752ccec2ad3f5a8dd051bce83c"   # devel: graph verbs (#31), demo wire fixes (#33)
+REF="d4346f928fa4d8e1d9927edf41a5aa7a1eaa6e6a"   # devel: twin outputs (#38), graph verbs (#31), wire fixes (#33)
 
 # The radical dependencies must NOT come from naive PyPI resolution: PyPI's
 # rhapsody-py 0.4.0 lacks `rhapsody.backends.execution.orbit` (the