diff --git a/12.0.Dockerfile-python3.6 b/12.0.Dockerfile-python3.6
index aee379077aea74bfce7ac0089b486f1c064dc7ca..86946ecf22ddc3723a90c94583d76b5b84fbbb28 100644
--- a/12.0.Dockerfile-python3.6
+++ b/12.0.Dockerfile-python3.6
@@ -23,7 +23,7 @@ RUN set -x; \
         apt-get install -y --no-install-recommends postgresql-client &&\
         apt-get install -y --no-install-recommends ${APT_DEPS} &&\
         pip install -I -r https://raw.githubusercontent.com/OCA/OCB/12.0/requirements.txt &&\
-        pip install simplejson WTForms zxcvbn phonenumbers Werkzeug==0.14.1 &&\
+        pip install simplejson WTForms zxcvbn PyYAML zxcvbn phonenumbers Werkzeug==0.14.1 &&\
         apt-get -y purge ${APT_DEPS} &&\
         apt-get -y autoremove &&\
         rm -rf /var/lib/apt/lists/* wkhtmltox.deb