diff --git a/scripts/files/elements/fedora-guest/extra-data.d/15-reddwarf-dep b/scripts/files/elements/fedora-guest/extra-data.d/15-reddwarf-dep
index 7d86e5df..95ce5da4 100755
--- a/scripts/files/elements/fedora-guest/extra-data.d/15-reddwarf-dep
+++ b/scripts/files/elements/fedora-guest/extra-data.d/15-reddwarf-dep
@@ -17,3 +17,16 @@ REQUIREMENTS_FILE=${REDSTACK_SCRIPTS}/files/requirements/fedora-requirements-${A
 [ -n "$HOST_USERNAME" ] || die "HOST_USERNAME not set"
 
 sudo -Hiu ${HOST_USERNAME} dd if=${REQUIREMENTS_FILE} of=${TMP_HOOKS_PATH}/requirements.txt
+
+# Grab the upper constraints file, but don't fail if we can't find it
+UC_DIR=$(pwd)
+UC_FILE=upper-constraints.txt
+UC_BRANCH=${BRANCH_OVERRIDE}
+if [ "${ADD_BRANCH}" == "default" ]; then
+    UC_BRANCH=master
+fi
+set +e; curl -o "${UC_DIR}/${UC_FILE}" https://git.openstack.org/cgit/openstack/requirements/plain/${UC_FILE}?h=${UC_BRANCH}; set -e
+if [ -f "${UC_DIR}/${UC_FILE}" ]; then
+    sudo -Hiu ${HOST_USERNAME} dd if="${UC_DIR}/${UC_FILE}" of=${TMP_HOOKS_PATH}/${UC_FILE}
+    rm -f "${UC_DIR}/${UC_FILE}"
+fi
diff --git a/scripts/files/elements/fedora-guest/install.d/15-reddwarf-dep b/scripts/files/elements/fedora-guest/install.d/15-reddwarf-dep
index 5c56d34d..7f3d0dde 100755
--- a/scripts/files/elements/fedora-guest/install.d/15-reddwarf-dep
+++ b/scripts/files/elements/fedora-guest/install.d/15-reddwarf-dep
@@ -18,4 +18,9 @@ dnf install -y python-devel libxml2-devel libxslt-devel python-setuptools \
 
 TMP_HOOKS_DIR="/tmp/in_target.d"
 
-pip install -q --upgrade -r ${TMP_HOOKS_DIR}/requirements.txt
+UPPER_CONSTRAINTS=
+if [ -f ${TMP_HOOKS_DIR}/upper-constraints.txt ]; then
+    UPPER_CONSTRAINTS=" -c ${TMP_HOOKS_DIR}/upper-constraints.txt"
+fi
+
+pip install -q --upgrade -r ${TMP_HOOKS_DIR}/requirements.txt ${UPPER_CONSTRAINTS}
diff --git a/scripts/files/elements/ubuntu-guest/extra-data.d/15-reddwarf-dep b/scripts/files/elements/ubuntu-guest/extra-data.d/15-reddwarf-dep
index a99e81f5..ee60889f 100755
--- a/scripts/files/elements/ubuntu-guest/extra-data.d/15-reddwarf-dep
+++ b/scripts/files/elements/ubuntu-guest/extra-data.d/15-reddwarf-dep
@@ -17,3 +17,16 @@ REQUIREMENTS_FILE=${REDSTACK_SCRIPTS}/files/requirements/ubuntu-requirements-${A
 [ -n "$HOST_USERNAME" ] || die "HOST_USERNAME not set"
 
 sudo -Hiu ${HOST_USERNAME} dd if=${REQUIREMENTS_FILE} of=${TMP_HOOKS_PATH}/requirements.txt
+
+# Grab the upper constraints file, but don't fail if we can't find it
+UC_DIR=$(pwd)
+UC_FILE=upper-constraints.txt
+UC_BRANCH=${BRANCH_OVERRIDE}
+if [ "${ADD_BRANCH}" == "default" ]; then
+    UC_BRANCH=master
+fi
+set +e; curl -o "${UC_DIR}/${UC_FILE}" https://git.openstack.org/cgit/openstack/requirements/plain/${UC_FILE}?h=${UC_BRANCH}; set -e
+if [ -f "${UC_DIR}/${UC_FILE}" ]; then
+    sudo -Hiu ${HOST_USERNAME} dd if="${UC_DIR}/${UC_FILE}" of=${TMP_HOOKS_PATH}/${UC_FILE}
+    rm -f "${UC_DIR}/${UC_FILE}"
+fi
diff --git a/scripts/files/elements/ubuntu-guest/install.d/15-reddwarf-dep b/scripts/files/elements/ubuntu-guest/install.d/15-reddwarf-dep
index 99016887..0286715b 100755
--- a/scripts/files/elements/ubuntu-guest/install.d/15-reddwarf-dep
+++ b/scripts/files/elements/ubuntu-guest/install.d/15-reddwarf-dep
@@ -19,4 +19,9 @@ apt-get -y install python-dev libxml2-dev libxslt1-dev python-setuptools \
 
 TMP_HOOKS_DIR="/tmp/in_target.d"
 
-pip install -q --upgrade -r ${TMP_HOOKS_DIR}/requirements.txt
+UPPER_CONSTRAINTS=
+if [ -f ${TMP_HOOKS_DIR}/upper-constraints.txt ]; then
+    UPPER_CONSTRAINTS=" -c ${TMP_HOOKS_DIR}/upper-constraints.txt"
+fi
+
+pip install -q --upgrade -r ${TMP_HOOKS_DIR}/requirements.txt ${UPPER_CONSTRAINTS}