diff --git a/requirements.txt b/requirements.txt
index 2004117..8dcf868 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 # API requirements
 
-langchain>=0.0.343
+langchain==0.0.343
 langchain-experimental>=0.0.42
 fschat[model_worker]>=0.2.33
 xformers>=0.0.22.post7
diff --git a/requirements_api.txt b/requirements_api.txt
index 122c16c..9b31aad 100644
--- a/requirements_api.txt
+++ b/requirements_api.txt
@@ -1,6 +1,6 @@
 # API requirements
 
-langchain>=0.0.343
+langchain==0.0.343
 langchain-experimental>=0.0.42
 fschat[model_worker]>=0.2.33
 xformers>=0.0.22.post7
diff --git a/requirements_lite.txt b/requirements_lite.txt
index 7fc107c..e9d4493 100644
--- a/requirements_lite.txt
+++ b/requirements_lite.txt
@@ -1,4 +1,4 @@
-langchain>=0.0.343
+langchain==0.0.343
 fschat>=0.2.33
 openai>=1.3.5
 # sentence_transformers