diff --git a/Dockerfile b/Dockerfile
index ad65312..57a8006 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,7 @@ FROM ruby:2.6.5-alpine
 EXPOSE 4000
 
 RUN apk --no-cache add \
+  bash \
   g++ \
   git \
   make