diff --git a/Dockerfile b/Dockerfile
index 4ccf234..16cddb6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 FROM alpine:latest
 
 RUN \
-  apk --update upgrade && \
-  apk add tini curl pdns pdns-backend-sqlite3
+  apk --no-cache upgrade && \
+  apk --no-cache add tini curl pdns pdns-backend-sqlite3
 
 COPY rootfs /