diff --git a/Dockerfile b/Dockerfile
index 32e0831..f0d0831 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,7 @@
 FROM python:3-alpine
 
 RUN pip install yamllint && \
+    apk add bash && \
     rm -rf ~/.cache/pip
 
 ADD entrypoint.sh /entrypoint.sh