diff --git a/Dockerfile b/Dockerfile
index aaa996691..2fc70330f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,13 +1,13 @@
 ARG NODE_IMAGE=node
 FROM ${NODE_IMAGE}:lts AS build
 WORKDIR /app
-ENV NODE_ENV production
+ENV NODE_ENV=production
 RUN set -eux; \
   npm install --production tkserver@latest; \
   mkdir -p data
-FROM ${NODE_IMAGE}:lts-buster-slim
+FROM ${NODE_IMAGE}:lts-alpine
 WORKDIR /app
-ENV NODE_ENV production
+ENV NODE_ENV=production
 COPY --from=build /app .
 EXPOSE 8080
 CMD ["/app/node_modules/.bin/tkserver"]