diff --git a/Dockerfile b/Dockerfile
index bd0af5b..31d85e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@ ARG GIT_SHA=dev
 LABEL org.opencontainers.image.version="${VERSION}"
 LABEL org.opencontainers.image.revision="${GIT_SHA}"
 
-RUN apk add mailcap \
+RUN apk add --no-cache mailcap \
     && adduser -D -u 1000 beam \
     && mkdir /uploads \
     && chown beam /uploads