diff --git a/Dockerfile b/Dockerfile
index 631657b..1f9d70a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,6 +4,7 @@ RUN apt-get update -qq && apt-get install -yq --no-install-recommends \
     build-essential \
     git \
     sqlite3 \
+    yarn \
   && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 ENV LANG=C.UTF-8 \