diff --git a/Dockerfile b/Dockerfile
index 9191172..415e43a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,8 +7,11 @@ LABEL stage="build-local-testing"
 
 WORKDIR /app
 
-# Copy package.json and package-lock.json (or yarn.lock)
+# Copy root package.json/lockfile plus workspace manifests so npm can
+# resolve the @ttrpg/shared and server workspace links during install.
 COPY package*.json ./
+COPY shared/package.json ./shared/
+COPY server/package.json ./server/
 
 # Install dependencies using the lock file for consistency
 RUN npm install