diff --git a/lib/worker_multibuild.py b/lib/worker_multibuild.py
index f51abcd..b258926 100644
--- a/lib/worker_multibuild.py
+++ b/lib/worker_multibuild.py
@@ -24,12 +24,14 @@ RUN apt-get update -y && apt-get install -yq --no-install-suggests --no-install-
 # buildbot entrypoint
 RUN wget -O /usr/local/bin/buildbot_entrypoint.sh https://git.bitmessage.org/Bitmessage/buildbot-scripts/raw/branch/master/docker/bionic/entrypoint.sh
 RUN chmod +x /usr/local/bin/buildbot_entrypoint.sh
+RUN wget -O /usr/local/share/ca-certificates/buildbot-ca.crt https://git.bitmessage.org/Bitmessage/buildbot-scripts/raw/branch/master/docker/bionic/buildbot-ca.crt
+RUN update-ca-certificates
 
 RUN echo 'buildbot ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
 
 USER buildbot
 
-ENTRYPOINT /usr/local/bin/buildbot_entrypoint.sh "$BUILDMASTER" "$WORKERNAME" "$WORKERPASS"
+ENTRYPOINT /usr/local/bin/buildbot_entrypoint.sh "$CONNECTIONSTRING" "$WORKERNAME" "$WORKERPASS"
 
 """
 
@@ -43,12 +45,14 @@ RUN apt-get update -y && apt-get install -yq --no-install-suggests --no-install-
 # buildbot entrypoint
 RUN wget -O /usr/local/bin/buildbot_entrypoint.sh https://git.bitmessage.org/Bitmessage/buildbot-scripts/raw/branch/master/docker/bionic/entrypoint.sh
 RUN chmod +x /usr/local/bin/buildbot_entrypoint.sh
+RUN wget -O /usr/local/share/ca-certificates/buildbot-ca.crt https://git.bitmessage.org/Bitmessage/buildbot-scripts/raw/branch/master/docker/bionic/buildbot-ca.crt
+RUN update-ca-certificates
 
 RUN echo 'buildbot ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
 
 USER buildbot
 
-ENTRYPOINT /usr/local/bin/buildbot_entrypoint.sh "$BUILDMASTER" "$WORKERNAME" "$WORKERPASS"
+ENTRYPOINT /usr/local/bin/buildbot_entrypoint.sh "$CONNECTIONSTRING" "$WORKERNAME" "$WORKERPASS"
 
 """
 
@@ -62,12 +66,14 @@ RUN apt-get update -y && apt-get install -yq --no-install-suggests --no-install-
 # buildbot entrypoint
 RUN wget -O /usr/local/bin/buildbot_entrypoint.sh https://git.bitmessage.org/Bitmessage/buildbot-scripts/raw/branch/master/docker/bionic/entrypoint.sh
 RUN chmod +x /usr/local/bin/buildbot_entrypoint.sh
+RUN wget -O /usr/local/share/ca-certificates/buildbot-ca.crt https://git.bitmessage.org/Bitmessage/buildbot-scripts/raw/branch/master/docker/bionic/buildbot-ca.crt
+RUN update-ca-certificates
 
 RUN echo 'buildbot ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
 
 USER buildbot
 
-ENTRYPOINT /usr/local/bin/buildbot_entrypoint.sh "$BUILDMASTER" "$WORKERNAME" "$WORKERPASS"
+ENTRYPOINT /usr/local/bin/buildbot_entrypoint.sh "$CONNECTIONSTRING" "$WORKERNAME" "$WORKERPASS"
 
 """
 
@@ -86,12 +92,14 @@ RUN dpkg -i dumb-init_*.deb && rm -f dumb-init_*.deb
 # buildbot entrypoint
 RUN [ -f /usr/local/bin/buildbot_entrypoint.sh ] || wget -O /usr/local/bin/buildbot_entrypoint.sh https://git.bitmessage.org/Bitmessage/buildbot-scripts/raw/branch/master/docker/xenial/entrypoint.sh
 RUN chmod +x /usr/local/bin/buildbot_entrypoint.sh
+RUN wget -O /usr/local/share/ca-certificates/buildbot-ca.crt https://git.bitmessage.org/Bitmessage/buildbot-scripts/raw/branch/master/docker/bionic/buildbot-ca.crt
+RUN update-ca-certificates
 
 RUN echo 'buildbot ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
 
 USER buildbot
 
-ENTRYPOINT /usr/local/bin/buildbot_entrypoint.sh "$BUILDMASTER" "$WORKERNAME" "$WORKERPASS"
+ENTRYPOINT /usr/local/bin/buildbot_entrypoint.sh "$CONNECTIONSTRING" "$WORKERNAME" "$WORKERPASS"
 
 """