diff --git a/Dockerfile b/Dockerfile
index 0a5c0ba..7f87db7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,6 +19,9 @@ FROM nginx:alpine
 # Copy built files
 COPY --from=builder /app/dist /usr/share/nginx/html
 
+# .mjs files (pdfjs worker) must be served as application/javascript for module workers
+RUN sed -i 's|application/javascript\s*js;|application/javascript js mjs;|' /etc/nginx/mime.types
+
 # Create a simple nginx configuration
 RUN echo 'server { \
     listen 3000; \