diff --git a/Dockerfile b/Dockerfile
index 4169740..c013227 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,6 +17,12 @@ WORKDIR /app
 
 COPY package* ./
 
+RUN set -ex \
+    && apk --no-cache upgrade \
+    && apk --no-cache add curl ca-certificates \
+    && update-ca-certificates \
+    && npm install
+
 COPY index.js ./index.js
 
 COPY healthcheck.sh /app/healthcheck.sh