diff --git a/app/server.py b/app/server.py
index 5e509ea..3e1a5ac 100644
--- a/app/server.py
+++ b/app/server.py
@@ -1,6 +1,6 @@
 from fastapi import FastAPI, Request
 from fastapi.responses import JSONResponse, RedirectResponse
-from langchain_community.chat_models import ChatOpenAI
+from langchain_openai import ChatOpenAI
 from langserve import add_routes
 
 from langchain_core.prompts import ChatPromptTemplate
diff --git a/poetry.lock b/poetry.lock
index b4310ad..524e43c 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2936,6 +2936,25 @@ files = [
 [package.extras]
 diagrams = ["jinja2", "railroad-diagrams"]
 
+[[package]]
+name = "pypdf"
+version = "5.1.0"
+description = "A pure-python PDF library capable of splitting, merging, cropping, and transforming PDF files"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pypdf-5.1.0-py3-none-any.whl", hash = "sha256:3bd4f503f4ebc58bae40d81e81a9176c400cbbac2ba2d877367595fb524dfdfc"},
+    {file = "pypdf-5.1.0.tar.gz", hash = "sha256:425a129abb1614183fd1aca6982f650b47f8026867c0ce7c4b9f281c443d2740"},
+]
+
+[package.extras]
+crypto = ["cryptography"]
+cryptodome = ["PyCryptodome"]
+dev = ["black", "flit", "pip-tools", "pre-commit (<2.18.0)", "pytest-cov", "pytest-socket", "pytest-timeout", "pytest-xdist", "wheel"]
+docs = ["myst_parser", "sphinx", "sphinx_rtd_theme"]
+full = ["Pillow (>=8.0.0)", "cryptography"]
+image = ["Pillow (>=8.0.0)"]
+
 [[package]]
 name = "pypika"
 version = "0.48.9"
@@ -4300,4 +4319,4 @@ type = ["pytest-mypy"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "8880baf1589d36f8b10462ccaec00ae7f20346a3d7e61383c9bfbd7d8ff1dadc"
+content-hash = "f53d4ac516ba79f844b58552da162a79b030be6080172951005c7e132d29cec2"
diff --git a/pyproject.toml b/pyproject.toml
index 236c39d..3573028 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,7 @@ jsonify = "^0.5"
 protobuf = "^3.20.3"
 pytz = "^2024.2"
 telebot = "^0.0.5"
+pypdf = "^5.1.0"