diff --git a/backend/Dockerfile b/backend/Dockerfile
index 2ee0298..80f8dc8 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,7 +1,9 @@
 FROM node:20-alpine AS builder
 
-# Install OpenSSL and Git for Prisma and GitHub dependencies
-RUN apk add --no-cache openssl git
+# Install OpenSSL, Git, and Bun for Prisma, GitHub dependencies, and tinypdf-plus
+RUN apk add --no-cache openssl git curl && \
+    curl -fsSL https://bun.sh/install | sh && \
+    /root/.bun/bin/bun --version
 
 WORKDIR /app
 
@@ -14,7 +16,7 @@ COPY prisma ./prisma/
 RUN npm install
 
 # Build tinypdf-plus package
-RUN cd node_modules/tinypdf-plus && npm run build || (echo "tinypdf-plus build failed" && exit 1)
+RUN cd node_modules/tinypdf-plus && /root/.bun/bin/bun run build || (echo "tinypdf-plus build failed" && exit 1)
 
 # Copy source
 COPY . .