diff --git a/Dockerfile.alpine b/Dockerfile.alpine
index 0a370c7..3f91a12 100644
--- a/Dockerfile.alpine
+++ b/Dockerfile.alpine
@@ -1,6 +1,6 @@
 FROM alpine:3.7
 
-RUN apk add -U --no-cache ca-certificates
+RUN apk add --no-cache ca-certificates
 
 COPY release/linux/amd64/drone /bin/