diff --git a/src/crewai/agents/agent_adapters/langgraph/langgraph_adapter.py b/src/crewai/agents/agent_adapters/langgraph/langgraph_adapter.py
index c3b77c925..d73206330 100644
--- a/src/crewai/agents/agent_adapters/langgraph/langgraph_adapter.py
+++ b/src/crewai/agents/agent_adapters/langgraph/langgraph_adapter.py
@@ -22,10 +22,10 @@ from crewai.utilities import Logger
 from crewai.utilities.converter import Converter
 
 try:
-    from langgraph.checkpoint.memory import (
-        MemorySaver,  # type: ignore[import-not-found]
+    from langgraph.checkpoint.memory import (  # type: ignore
+        MemorySaver,
     )
-    from langgraph.prebuilt import create_react_agent  # type: ignore[import-not-found]
+    from langgraph.prebuilt import create_react_agent  # type: ignore
 
     LANGGRAPH_AVAILABLE = True
 except ImportError:
diff --git a/src/crewai/agents/agent_adapters/langgraph/structured_output_converter.py b/src/crewai/agents/agent_adapters/langgraph/structured_output_converter.py
index 715f80d70..322c4317d 100644
--- a/src/crewai/agents/agent_adapters/langgraph/structured_output_converter.py
+++ b/src/crewai/agents/agent_adapters/langgraph/structured_output_converter.py
@@ -12,8 +12,8 @@ class LangGraphConverterAdapter(BaseConverterAdapter):
         """Initialize the converter adapter with a reference to the agent adapter"""
         self.agent_adapter = agent_adapter
         self._output_format: str | None = None
-        self._schema = None
-        self._system_prompt_appendix = None
+        self._schema: str | None = None
+        self._system_prompt_appendix: str | None = None
 
     def configure_structured_output(self, task: Any) -> None:
         """Configure the structured output for LangGraph."""