diff --git a/Dockerfile b/Dockerfile
index 54fbd16d..e3669a92 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,10 +11,10 @@ FROM alpine:3.7
 
 RUN apk add --no-cache ca-certificates
 
-ENV HELM_VERSION=v2.8.2
-ENV HELM_LOCATION="https://kubernetes-helm.storage.googleapis.com"
-ENV HELM_FILENAME="helm-${HELM_VERSION}-linux-amd64.tar.gz"
-ENV HELM_SHA256="614b5ac79de4336b37c9b26d528c6f2b94ee6ccacb94b0f4b8d9583a8dd122d3"
+ARG HELM_VERSION=v2.8.2
+ARG HELM_LOCATION="https://kubernetes-helm.storage.googleapis.com"
+ARG HELM_FILENAME="helm-${HELM_VERSION}-linux-amd64.tar.gz"
+ARG HELM_SHA256="614b5ac79de4336b37c9b26d528c6f2b94ee6ccacb94b0f4b8d9583a8dd122d3"
 RUN wget ${HELM_LOCATION}/${HELM_FILENAME} && \
     sha256sum ${HELM_FILENAME} | grep -q "${HELM_SHA256}" && \
     tar zxf ${HELM_FILENAME} && mv /linux-amd64/helm /usr/local/bin/ && \