diff --git a/Dockerfile b/Dockerfile
index 22e7e3e..b044a9c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,7 +20,7 @@
     git \
     x11-xkb-utils
 
-ENV DISPLAY=1
+ENV SELENIUM_HEADLESS=1
 
 RUN wget https://artifactory.mcp.mirantis.net/artifactory/binary-dev-local/tarballs/geckodriver-v0.24.0-linux64.tar.gz
 RUN tar xvzf geckodriver-v0.24.0-linux64.tar.gz && \
@@ -29,5 +29,5 @@
 
 WORKDIR /opt/horizon
 
-RUN pip3 install tox -U -r requirements.txt -r test-requirements.txt
+RUN pip3 install -r requirements.txt -r test-requirements.txt -c requirements/upper-constraints.txt
 
diff --git a/pre-build.sh b/pre-build.sh
index 0167dd2..e694430 100644
--- a/pre-build.sh
+++ b/pre-build.sh
@@ -8,7 +8,10 @@
 GERRIT_NAME=${GERRIT_NAME:-$(git remote -v | sed -n -e 's|^origin[[:space:]]\+\([[:alpha:]]\+\)://\([a-z0-9\-]\+\)@\([a-z.:0-9]\+\)/.*(fetch)$|\2|p')}
 GERRIT_HOST_PORT=${GERRIT_HOST_PORT:-$(git remote -v | sed -n -e 's|^origin[[:space:]]\+\([[:alpha:]]\+\)://\([a-z0-9\-]\+\)@\([a-z.:0-9]\+\)/.*(fetch)$|\3|p')}
 HORIZON_LIB_REPO="${GERRIT_SCHEME}://${GERRIT_NAME}@${GERRIT_HOST_PORT}/packaging/sources/horizon"
+REQUIREMENTS_REPO="${GERRIT_SCHEME}://${GERRIT_NAME}@${GERRIT_HOST_PORT}/packaging/sources/requirements"
 
 git clone ${HORIZON_LIB_REPO}
 cd horizon/ ; git checkout origin/mcp/train
+git clone ${REQUIREMENTS_REPO}
+cd requirements/ ; git checkout origin/mcp/train