diff --git a/service3/Dockerfile b/service3/Dockerfile
index 8661acf..e9ab1ea 100644
--- a/service3/Dockerfile
+++ b/service3/Dockerfile
@@ -4,7 +4,7 @@ WORKDIR /app
 
 COPY . /app
 
-RUN pip install --no-cache-dir fastapi uvicorn redis requests openai langchain python-dotenv postgres psycopg2-binary pgvector
+RUN pip install --no-cache-dir fastapi uvicorn redis requests tiktoken openai langchain python-dotenv postgres psycopg2-binary pgvector
 
 # install postgresql client
 RUN apt-get update && apt-get install -y postgresql-client && rm -rf /var/lib/apt/lists/*