diff --git a/Dockerfile b/Dockerfile
index 8df76bc..4b37cf0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,8 +17,7 @@ COPY package*.json tsconfig.json .npmrc ./
 
 # Install
 ARG NPM_TOKEN
-ENV NPM_TOKEN ${NPM_TOKEN}
-RUN npm install
+RUN npm install --//npm.token=${NPM_TOKEN}
 
 # Copy the app
 COPY src ./src
@@ -32,8 +31,7 @@ FROM node:lts-alpine
 # Install dependencies but skip dev dependencies
 COPY --from=build /app/package*.json /app/.npmrc ./
 ARG NPM_TOKEN
-ENV NPM_TOKEN ${NPM_TOKEN}
-RUN npm install --only=production
+RUN npm install --only=production --//npm.token=${NPM_TOKEN}
 
 # Copy the app
 COPY --from=build /app/dist ./dist
diff --git a/scripts/build.sh b/scripts/build.sh
index ab268ca..20a2d9f 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -51,7 +51,8 @@ fi
 
 # cd to the project root directory.
 cd "$(dirname "$0")/.."
-docker build -t butlerbot:$VERSION .
+source .env
+docker build --build-arg NPM_TOKEN=$NPM_TOKEN -t butlerbot:$VERSION .
 
 # Tag the Docker image.
 for TAG in "${TAGS[@]}"; do