diff --git a/requirements.txt b/requirements.txt
index c82793f3..6ff7bec0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
+horizon>=13.0.0  # Apache-2.0
 Babel!=2.4.0,>=2.3.4 # BSD
 openstacksdk>=0.11.2 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
diff --git a/tools/tox_install.sh b/tools/tox_install.sh
deleted file mode 100755
index 9c10d94a..00000000
--- a/tools/tox_install.sh
+++ /dev/null
@@ -1,105 +0,0 @@
-#!/usr/bin/env bash
-
-# Many of horizon's repos suffer from the problem of depending on horizon,
-# but it not existing on pypi.
-
-# This wrapper for tox's package installer will use the existing package
-# if it exists, else use zuul-cloner if that program exists, else grab it
-# from horizon master via a hard-coded URL. That last case should only
-# happen with devs running unit tests locally.
-
-# From the tox.ini config page:
-# install_command=ARGV
-# default:
-# pip install {opts} {packages}
-
-ZUUL_CLONER=/usr/zuul-env/bin/zuul-cloner
-BRANCH_NAME=master
-
-install_project() {
-    local project=$1
-    local branch=${2:-$BRANCH_NAME}
-    local PROJECT_DIR=$HOME/$project
-    local ZUULV3_PROJECT_DIR=$HOME/src/git.openstack.org/openstack/$project
-
-    set +e
-    project_installed=$(echo "import $project" | python 2>/dev/null ; echo $?)
-    set -e
-
-    # The devstack based functional tests have project checked out in
-    # $PROJECT_DIR on the test systems - with the change to test in it.
-    # Use this directory if it exists, so that this script installs the
-    # project version to test here.
-    # Note that the functional tests use sudo to run tox and thus
-    # variables used for zuul-cloner to check out the correct version are
-    # lost.
-    if [ -d "$ZUULV3_PROJECT_DIR" ]; then
-        echo "FOUND $project code at $ZUULV3_PROJECT_DIR - using"
-        $install_cmd -U $ZUULV3_PROJECT_DIR
-    elif [ -d "$PROJECT_DIR" ]; then
-        echo "FOUND $project code at $PROJECT_DIR - using"
-        $install_cmd -U $PROJECT_DIR
-    elif [ $project_installed -eq 0 ]; then
-        echo "ALREADY INSTALLED" > /tmp/tox_install.txt
-        location=$(python -c "import $project; print($project.__file__)")
-        echo "ALREADY INSTALLED at $location"
-
-        echo "$project already installed; using existing package"
-    elif [ -x "$ZUUL_CLONER" ]; then
-        echo "ZUUL CLONER" > /tmp/tox_install.txt
-        # Make this relative to current working directory so that
-        # git clean can remove it. We cannot remove the directory directly
-        # since it is referenced after $install_cmd
-        mkdir -p .tmp
-        PROJECT_DIR=$(/bin/mktemp -d -p $(pwd)/.tmp)
-        pushd $PROJECT_DIR
-        $ZUUL_CLONER --cache-dir \
-            /opt/git \
-            --branch $branch \
-            http://git.openstack.org \
-            openstack/$project
-        cd openstack/$project
-        $install_cmd .
-        popd
-    else
-        echo "PIP HARDCODE" > /tmp/tox_install.txt
-        if [ -z "$PIP_LOCATION" ]; then
-            PIP_LOCATION="git+https://git.openstack.org/openstack/$project@$branch#egg=$project"
-        fi
-        $install_cmd -U ${PIP_LOCATION}
-    fi
-}
-
-# Client constraint file contains this client version pin that is in conflict
-# with installing the client from source. We should remove the version pin in
-# the constraints file before applying it for from-source installation.
-
-CONSTRAINTS_FILE="$1"
-shift 1
-
-set -e
-set -x
-
-# NOTE(tonyb): Place this in the tox enviroment's log dir so it will get
-# published to logs.openstack.org for easy debugging.
-localfile="$VIRTUAL_ENV/log/upper-constraints.txt"
-
-if [[ "$CONSTRAINTS_FILE" != http* ]]; then
-    CONSTRAINTS_FILE="file://$CONSTRAINTS_FILE"
-fi
-# NOTE(tonyb): need to add curl to bindep.txt if the project supports bindep
-curl "$CONSTRAINTS_FILE" --insecure --progress-bar --output "$localfile"
-
-pip install -c"$localfile" openstack-requirements
-
-# This is the main purpose of the script: Allow local installation of
-# the current repo. It is listed in constraints file and thus any
-# install will be constrained and we need to unconstrain it.
-edit-constraints "$localfile" -- "$CLIENT_NAME"
-
-install_cmd="pip install -c$localfile"
-
-install_project horizon
-
-$install_cmd -U $*
-exit $?
diff --git a/tox.ini b/tox.ini
index 9e09e6e3..df955ca3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,7 +5,7 @@ skipsdist = True
 
 [testenv]
 usedevelop = True
-install_command = {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+install_command = pip install {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
    NOSE_WITH_OPENSTACK=1
@@ -13,8 +13,8 @@ setenv =
    NOSE_OPENSTACK_RED=0.05
    NOSE_OPENSTACK_YELLOW=0.025
    NOSE_OPENSTACK_SHOW_ELAPSED=1
-   CLIENT_NAME=octavia-dashboard
-deps = -r{toxinidir}/requirements.txt
+deps = -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+       -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 whitelist_externals = npm
                       bash