diff --git a/packages/backend/Dockerfile b/packages/backend/Dockerfile
index d71929e..b3dd381 100644
--- a/packages/backend/Dockerfile
+++ b/packages/backend/Dockerfile
@@ -1,4 +1,16 @@
-FROM node:20-alpine
+FROM node:20-slim
+
+# Install wkhtmltopdf + minimal deps, then clean up apt caches
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+      wkhtmltopdf         \
+      fontconfig          \
+      fonts-dejavu-core   \
+      ca-certificates     \
+      libx11-6            \
+      libxrender1         \
+      libxext6            \
+ && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app