diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e23366821..f631625cd 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -12,7 +12,7 @@ repos:
     hooks:
       - id: check-typing-imports
         name: Check for Dict, List, or Union usage
-        entry: bash -c 'echo "Checking for typing imports..." && find . -name "*.py" | grep -v "/migrations/" | grep -v "/.venv/" | xargs grep -n "from typing.*import.*[^d]Dict\\|from typing.*import.*List" || exit 0 && echo "⚠️  Please import dict instead of Dict, list instead of List, and the logical OR operator" && exit 1'
+        entry: bash -c 'echo "Checking for typing imports..." && find . -name "*.py" | grep -v "/migrations/" | grep -v "/.venv/" | xargs grep -n "from typing.*import.*[^d]Dict\\|from typing.*import.*List\\|from typing.*import.*Union" || exit 0 && echo "⚠️  Please import dict instead of Dict, list instead of List, and the logical OR operator" && exit 1'
         language: system
         types: [python]
         pass_filenames: false
diff --git a/py/sdk/asnyc_methods/retrieval.py b/py/sdk/asnyc_methods/retrieval.py
index 7c393369d..d825a91f8 100644
--- a/py/sdk/asnyc_methods/retrieval.py
+++ b/py/sdk/asnyc_methods/retrieval.py
@@ -280,7 +280,7 @@ class RetrievalSDK:
             search_settings (Optional[dict | SearchSettings]): The search configuration object.
             task_prompt (Optional[str]): Optional custom prompt to override default.
             include_title_if_available (Optional[bool]): Include document titles from search results.
-            conversation_id (Optional[Union[str, uuid.UUID]]): ID of the conversation.
+            conversation_id (Optional[str | uuid.UUID]): ID of the conversation.
             tools (Optional[list[str]]): List of tools to execute (deprecated).
             rag_tools (Optional[list[str]]): List of tools to enable for RAG mode.
             research_tools (Optional[list[str]]): List of tools to enable for Research mode.
diff --git a/py/sdk/sync_methods/retrieval.py b/py/sdk/sync_methods/retrieval.py
index 1a0fdde14..b250dd70e 100644
--- a/py/sdk/sync_methods/retrieval.py
+++ b/py/sdk/sync_methods/retrieval.py
@@ -1,6 +1,6 @@
 import json
 import uuid
-from typing import Any, Generator, Optional, Union
+from typing import Any, Generator, Optional
 
 from core.base.api.models import (
     AgentEvent,
@@ -231,7 +231,7 @@ def agent_arg_parser(
     search_settings: Optional[dict | SearchSettings] = None,
     task_prompt: Optional[str] = None,
     include_title_if_available: Optional[bool] = True,
-    conversation_id: Optional[Union[str, uuid.UUID]] = None,
+    conversation_id: Optional[str | uuid.UUID] = None,
     max_tool_context_length: Optional[int] = None,
     use_system_context: Optional[bool] = True,
     rag_tools: Optional[list[str]] = None,
@@ -433,7 +433,7 @@ class RetrievalSDK:
         search_settings: Optional[dict | SearchSettings] = None,
         task_prompt: Optional[str] = None,
         include_title_if_available: Optional[bool] = True,
-        conversation_id: Optional[Union[str, uuid.UUID]] = None,
+        conversation_id: Optional[str | uuid.UUID] = None,
         max_tool_context_length: Optional[int] = None,
         use_system_context: Optional[bool] = True,
         # Tool configurations
@@ -467,7 +467,7 @@ class RetrievalSDK:
             search_settings (Optional[dict | SearchSettings]): Vector search settings.
             task_prompt (Optional[str]): Task prompt override.
             include_title_if_available (Optional[bool]): Include the title if available.
-            conversation_id (Optional[Union[str, uuid.UUID]]): ID of the conversation for maintaining context.
+            conversation_id (Optional[str | uuid.UUID]): ID of the conversation for maintaining context.
             max_tool_context_length (Optional[int]): Maximum context length for tool replies.
             use_system_context (Optional[bool]): Whether to use system context in the prompt.
             rag_tools (Optional[list[str]]): List of tools to enable for RAG mode.
diff --git a/py/shared/api/models/retrieval/responses.py b/py/shared/api/models/retrieval/responses.py
index 40892c31b..4253a15fe 100644
--- a/py/shared/api/models/retrieval/responses.py
+++ b/py/shared/api/models/retrieval/responses.py
@@ -1,4 +1,4 @@
-from typing import Any, Literal, Optional, Union
+from typing import Any, Literal, Optional
 
 from pydantic import BaseModel, Field
 
@@ -31,12 +31,10 @@ class Citation(R2RSerializable):
         description="The type of object, e.g. `citation`",
     )
     payload: Optional[
-        Union[
-            ChunkSearchResult,
-            GraphSearchResult,
-            WebPageSearchResult,
-            ContextDocumentResult,
-        ]
+        ChunkSearchResult
+        | GraphSearchResult
+        | WebPageSearchResult
+        | ContextDocumentResult
     ] = Field(
         ..., description="The object payload and it's corresponding type"
     )
@@ -445,28 +443,27 @@ class ThinkingEvent(SSEEventBase):
 
 
 # Create a union type for all RAG events
-RAGEvent = Union[
-    SearchResultsEvent,
-    MessageEvent,
-    CitationEvent,
-    FinalAnswerEvent,
-    UnknownEvent,
-    ToolCallEvent,
-    ToolResultEvent,
-    ToolResultData,
-    ToolResultEvent,
-]
+RAGEvent = (
+    SearchResultsEvent
+    | MessageEvent
+    | CitationEvent
+    | FinalAnswerEvent
+    | ToolCallEvent
+    | ToolResultEvent
+    | ToolResultData
+    | UnknownEvent
+)
 
-AgentEvent = Union[
-    ThinkingEvent,
-    SearchResultsEvent,
-    MessageEvent,
-    CitationEvent,
-    FinalAnswerEvent,
-    ToolCallEvent,
-    ToolResultEvent,
-    UnknownEvent,
-]
+AgentEvent = (
+    ThinkingEvent
+    | SearchResultsEvent
+    | MessageEvent
+    | CitationEvent
+    | FinalAnswerEvent
+    | ToolCallEvent
+    | ToolResultEvent
+    | UnknownEvent
+)
 
 WrappedCompletionResponse = R2RResults[LLMChatCompletion]
 # Create wrapped versions of the responses