diff --git a/agentlightning/tracer/base.py b/agentlightning/tracer/base.py
index 0f4a6afa0..1aae774d1 100644
--- a/agentlightning/tracer/base.py
+++ b/agentlightning/tracer/base.py
@@ -11,7 +11,7 @@
 from agentlightning.types import ParallelWorkerBase
 
 if TYPE_CHECKING:
-    from langchain.callbacks.base import BaseCallbackHandler  # type: ignore
+    from langchain_core.callbacks.base import BaseCallbackHandler  # type: ignore
 
 logger = logging.getLogger(__name__)
 
diff --git a/pyproject.toml b/pyproject.toml
index bfac5e1ad..b32541df2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,10 +55,10 @@ agent = [
   "autogen-ext[openai]",
   "mcp",
   "openai-agents",
-  "langgraph",
-  "langchain[openai]",
+  "langgraph<1.0",
+  "langchain[openai]<1.0",
   "langchain-community",
-  "langchain-text-splitters",
+  "langchain-text-splitters<1.0",
   "sqlparse",
   "nltk",
   "uv",