diff --git a/langchain/memory/chat_message_histories/zep.py b/langchain/memory/chat_message_histories/zep.py
index 0aabd5e65d1f2..d124fe27e8007 100644
--- a/langchain/memory/chat_message_histories/zep.py
+++ b/langchain/memory/chat_message_histories/zep.py
@@ -25,6 +25,7 @@ class ZepChatMessageHistory(BaseChatMessageHistory):
         zep_chat_history = ZepChatMessageHistory(
             session_id=session_id,
             url=ZEP_API_URL,
+            api_key=<your_api_key>,
         )
 
         # Use a standard ConversationBufferMemory to encapsulate the Zep chat history
@@ -37,7 +38,8 @@ class ZepChatMessageHistory(BaseChatMessageHistory):
     summarizes, embeds, indexes, and enriches conversational AI chat
     histories, and exposes them via simple, low-latency APIs.
 
-    For server installation instructions and more, see: https://getzep.github.io/
+    For server installation instructions and more, see:
+    https://docs.getzep.com/deployment/quickstart/
 
     This class is a thin wrapper around the zep-python package. Additional
     Zep functionality is exposed via the `zep_summary` and `zep_messages`
@@ -51,6 +53,7 @@ def __init__(
         self,
         session_id: str,
         url: str = "http://localhost:8000",
+        api_key: Optional[str] = None,
     ) -> None:
         try:
             from zep_python import ZepClient
@@ -60,7 +63,7 @@ def __init__(
                 "Please install it with `pip install zep-python`."
             )
 
-        self.zep_client = ZepClient(base_url=url)
+        self.zep_client = ZepClient(base_url=url, api_key=api_key)
         self.session_id = session_id
 
     @property
diff --git a/langchain/retrievers/zep.py b/langchain/retrievers/zep.py
index 38c9827cd5f8d..fff01da0d6fca 100644
--- a/langchain/retrievers/zep.py
+++ b/langchain/retrievers/zep.py
@@ -20,13 +20,14 @@ class ZepRetriever(BaseRetriever):
     histories, and exposes them via simple, low-latency APIs.
 
     For server installation instructions, see:
-    https://getzep.github.io/deployment/quickstart/
+    https://docs.getzep.com/deployment/quickstart/
     """
 
     def __init__(
         self,
         session_id: str,
         url: str,
+        api_key: Optional[str] = None,
         top_k: Optional[int] = None,
     ):
         try:
@@ -37,7 +38,7 @@ def __init__(
                 "Please install it with `pip install zep-python`."
             )
 
-        self.zep_client = ZepClient(base_url=url)
+        self.zep_client = ZepClient(base_url=url, api_key=api_key)
         self.session_id = session_id
         self.top_k = top_k
 
diff --git a/pyproject.toml b/pyproject.toml
index e92d386734f93..57e0c70e928d2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -89,7 +89,7 @@ pandas = {version = "^2.0.1", optional = true}
 telethon = {version = "^1.28.5", optional = true}
 neo4j = {version = "^5.8.1", optional = true}
 psychicapi = {version = "^0.5", optional = true}
-zep-python = {version=">=0.31", optional=true}
+zep-python = {version=">=0.32", optional=true}
 langkit = {version = ">=0.0.1.dev3, <0.1.0", optional = true}
 chardet = {version="^5.1.0", optional=true}
 requests-toolbelt = {version = "^1.0.0", optional = true}