diff --git a/CHANGELOG.md b/CHANGELOG.md
index c904f3963..8fb975686 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 0.12.1-dev4
+## 0.12.1-dev5
 
 ### Enhancements
 
@@ -12,6 +12,7 @@
 ### Fixes
 
 * **Fix GCS connector converting JSON to string with single quotes.** FSSpec serialization caused conversion of JSON token to string with single quotes. GCS requires token in form of dict so this format is now assured.
+* **Fix the serialization of the Pinecone destination connector.** Presence of the PineconeIndex object breaks serialization due to TypeError: cannot pickle '_thread.lock' object. This removes that object before serialization.
 
 ## 0.12.0
 
diff --git a/unstructured/__version__.py b/unstructured/__version__.py
index 2a145450a..291e14b02 100644
--- a/unstructured/__version__.py
+++ b/unstructured/__version__.py
@@ -1 +1 @@
-__version__ = "0.12.1-dev4"  # pragma: no cover
+__version__ = "0.12.1-dev5"  # pragma: no cover
diff --git a/unstructured/ingest/connector/pinecone.py b/unstructured/ingest/connector/pinecone.py
index fbe54310f..e117043e1 100644
--- a/unstructured/ingest/connector/pinecone.py
+++ b/unstructured/ingest/connector/pinecone.py
@@ -1,3 +1,4 @@
+import copy
 import json
 import multiprocessing as mp
 import typing as t
@@ -5,6 +6,7 @@ import uuid
 from dataclasses import dataclass
 
 from unstructured.ingest.enhanced_dataclass import enhanced_field
+from unstructured.ingest.enhanced_dataclass.core import _asdict
 from unstructured.ingest.error import DestinationConnectionError, WriteError
 from unstructured.ingest.interfaces import (
     AccessConfig,
@@ -47,6 +49,18 @@ class PineconeDestinationConnector(IngestDocSessionHandleMixin, BaseDestinationC
     connector_config: SimplePineconeConfig
     _index: t.Optional["PineconeIndex"] = None
 
+    def to_dict(self, **kwargs):
+        """
+        The _index variable in this dataclass breaks deepcopy due to:
+        TypeError: cannot pickle '_thread.lock' object
+        When serializing, remove it, meaning client data will need to be reinitialized
+        when deserialized
+        """
+        self_cp = copy.copy(self)
+        if hasattr(self_cp, "_index"):
+            setattr(self_cp, "_index", None)
+        return _asdict(self_cp, **kwargs)
+
     @property
     def pinecone_index(self):
         if self._index is None: