diff --git a/pyproject.toml b/pyproject.toml
index 8ab7da1..e4a1a93 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,8 +26,8 @@ packages = [ { include = "manubot_ai_editor", from = "libs" } ]
 
 [tool.poetry.dependencies]
 python = ">=3.10,<4.0"
-langchain-core = ">=0.3.6"
-langchain-openai = ">=0.2.0"
+langchain-core = "^0.3.6"
+langchain-openai = "^0.2.0"
 pyyaml = "*"
 
 [tool.poetry.group.dev.dependencies]