diff --git a/Dockerfile b/Dockerfile
index 75c94bb..307d7a8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,7 @@ ARG CADDY_VERSION=2.11.2
 FROM node AS yarn_build
 WORKDIR /usr/app
 RUN apt-get update && apt-get install tar
+RUN npm install -g yarn
 RUN mkdir -p /usr/app/vendor/symfony
 RUN curl -L https://github.com/symfony/ux-autocomplete/archive/v2.7.1.tar.gz -o ux-autocomplete.tar.gz
 RUN tar -xzvf ux-autocomplete.tar.gz --directory /usr/app/vendor/symfony