diff --git a/Dockerfile b/Dockerfile
index 6a09ef9..d7948eb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,11 @@
-ARG ALPINE_IMAGE
+ARG ALPINE_IMAGE=alpine
+ARG ALPINE_VERSION=3.14
+ARG ZT_COMMIT=e8f7d5ef9e7ba6be0b2163cfa31f8817ba5b18f4
+ARG ZT_VERSION=1.6.5
 
-FROM ${ALPINE_IMAGE}:3.14 as builder
+FROM ${ALPINE_IMAGE}:${ALPINE_VERSION} as builder
 
-ENV ZT_COMMIT=e8f7d5ef9e7ba6be0b2163cfa31f8817ba5b18f4
-ENV ZT_VERSION=1.6.5
+ARG ZT_COMMIT
 
 RUN apk add --update alpine-sdk linux-headers \
   && git clone --quiet https://github.com/zerotier/ZeroTierOne.git /src \
@@ -11,7 +13,10 @@ RUN apk add --update alpine-sdk linux-headers \
   && cd /src \
   && make -f make-linux.mk
 
-FROM ${ALPINE_IMAGE}:3.14
+FROM ${ALPINE_IMAGE}:${ALPINE_VERSION}
+
+ARG ZT_VERSION
+
 LABEL version="${ZT_VERSION}"
 LABEL description="ZeroTier One as Docker Image"