diff --git a/pyproject.toml b/pyproject.toml
index 08156d8..7ecfdb4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,7 @@ dependencies = [
   "sentencepiece",
   "protobuf",
   "python-pptx",
+  "langchain",
 ]
 
 dynamic = ["version"]
diff --git a/requirements_base.txt b/requirements_base.txt
index 9c8092c..ac37df2 100644
--- a/requirements_base.txt
+++ b/requirements_base.txt
@@ -15,4 +15,5 @@ PyPDF2==3.0.1
 youtube_transcript_api==0.5.0
 sentencepiece==0.1.97
 protobuf==3.20.2
-python-pptx==0.6.21
\ No newline at end of file
+python-pptx==0.6.21
+langchain==0.0.93
\ No newline at end of file