diff --git a/Dockerfile b/Dockerfile
index 0a5a79b..d53886f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:bullseye-slim
+FROM debian:stretch-slim
 
 ARG PEERTUBE_VER=v2.0.0
 ARG NPM_RUN_BUILD_OPTS
@@ -11,6 +11,8 @@ ENV UID=991 \
 
 
 RUN groupadd -g 991 peertube && useradd -u 991 -g 991  --create-home peertube \
+	&& apt-get update \
+	&& apt-get -y --no-install-recommends  install curl gnupg ca-certificates \
 	&& echo "deb http://ftp.debian.org/debian bullseye-backports main contrib non-free" >> /etc/apt/sources.list \
 	&& curl -sL https://deb.nodesource.com/setup_10.x | bash - \
 	&& curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
@@ -23,6 +25,8 @@ RUN groupadd -g 991 peertube && useradd -u 991 -g 991  --create-home peertube \
 	&& echo "****** chown ******" \
 	&& chown -R peertube:peertube /app \
     && cd /app \
+	&& echo "****** run yarn install as user ******" \
+	&& su - peertube -c "cd /app && yarn install --pure-lockfile" \
 	&& echo "****** run npm install as user ******" \
 	&& su - peertube -c "cd /app && npm run build -- $NPM_RUN_BUILD_OPTS && rm -r ./node_modules ./client/node_modules " \
     && echo "****** run yarn install as user ******" \