diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index b0cbfac..09122e2 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -6,6 +6,8 @@ services:
     build:
       context: ./server
       dockerfile: Dockerfile.dev
+      additional_contexts:
+        platform-server: ../cc-platform-core/server
     container_name: turtle-server-dev
     ports:
       - "3001:3001"
diff --git a/docker-compose.yml b/docker-compose.yml
index d740de8..71030ef 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -4,6 +4,8 @@ services:
     build:
       context: ./server
       dockerfile: Dockerfile
+      additional_contexts:
+        platform-server: ../cc-platform-core/server
     container_name: turtle-server
     ports:
       - "4200:3001"  # HTTP API + WebSocket (unified)
diff --git a/server/Dockerfile b/server/Dockerfile
index 155ebb3..aec8ec8 100644
--- a/server/Dockerfile
+++ b/server/Dockerfile
@@ -3,9 +3,17 @@ FROM node:18-alpine
 
 WORKDIR /app
 
+# Copy platform server package from additional build context
+COPY --from=platform-server . /app/platform-server/
+RUN rm -rf /app/platform-server/node_modules
+
 # Copy package files
 COPY package*.json ./
 
+# Rewrite file: dependency to use the local copy inside the container
+RUN sed -i 's|file:../../cc-platform-core/server|file:./platform-server|' package.json \
+    && rm -f package-lock.json
+
 # Install dependencies
 RUN npm install --omit=dev
 
diff --git a/server/Dockerfile.dev b/server/Dockerfile.dev
index d7ac742..d562070 100644
--- a/server/Dockerfile.dev
+++ b/server/Dockerfile.dev
@@ -3,12 +3,20 @@ FROM node:18-alpine
 
 WORKDIR /app
 
+# Copy platform server package from additional build context
+COPY --from=platform-server . /app/platform-server/
+RUN rm -rf /app/platform-server/node_modules
+
 # Install nodemon for hot reload
 RUN npm install -g nodemon
 
 # Copy package files
 COPY package*.json ./
 
+# Rewrite file: dependency to use the local copy inside the container
+RUN sed -i 's|file:../../cc-platform-core/server|file:./platform-server|' package.json \
+    && rm -f package-lock.json
+
 # Install all dependencies (including dev)
 RUN npm install