diff --git a/langchain/agents/conversational_chat/base.py b/langchain/agents/conversational_chat/base.py
index 509fe870..94afc855 100644
--- a/langchain/agents/conversational_chat/base.py
+++ b/langchain/agents/conversational_chat/base.py
@@ -55,6 +55,10 @@ class ConversationalChatAgent(Agent):
 
     output_parser: BaseOutputParser
 
+    @property
+    def _agent_type(self) -> str:
+        raise NotImplementedError
+
     @property
     def observation_prefix(self) -> str:
         """Prefix to append the observation with."""
diff --git a/pyproject.toml b/pyproject.toml
index f6dbde14..68f6e1be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langchain"
-version = "0.0.110"
+version = "0.0.111"
 description = "Building applications with LLMs through composability"
 authors = []
 license = "MIT"