diff --git a/letta/orm/conversation.py b/letta/orm/conversation.py
index d7d9a254..7e41f575 100644
--- a/letta/orm/conversation.py
+++ b/letta/orm/conversation.py
@@ -44,7 +44,7 @@ class Conversation(SqlalchemyBase, OrganizationMixin):
         "ConversationMessage",
         back_populates="conversation",
         cascade="all, delete-orphan",
-        lazy="selectin",
+        lazy="raise",
     )
     isolated_blocks: Mapped[List["Block"]] = relationship(
         "Block",
diff --git a/letta/orm/conversation_messages.py b/letta/orm/conversation_messages.py
index c92ea500..81d62c0c 100644
--- a/letta/orm/conversation_messages.py
+++ b/letta/orm/conversation_messages.py
@@ -69,5 +69,5 @@ class ConversationMessage(SqlalchemyBase, OrganizationMixin):
     )
     message: Mapped["Message"] = relationship(
         "Message",
-        lazy="selectin",
+        lazy="raise",
     )