diff --git a/private_gpt/components/llm/prompt_helper.py b/private_gpt/components/llm/prompt_helper.py
index 512b02c2..58754119 100644
--- a/private_gpt/components/llm/prompt_helper.py
+++ b/private_gpt/components/llm/prompt_helper.py
@@ -286,8 +286,9 @@ class ChatMLPromptStyle(AbstractPromptStyle):
 
 
 def get_prompt_style(
-    prompt_style: Literal["default", "llama2", "llama3", "tag", "mistral", "chatml"]
-    | None
+    prompt_style: (
+        Literal["default", "llama2", "llama3", "tag", "mistral", "chatml"] | None
+    )
 ) -> AbstractPromptStyle:
     """Get the prompt style to use from the given string.
 
diff --git a/private_gpt/server/recipes/summarize/summarize_service.py b/private_gpt/server/recipes/summarize/summarize_service.py
index 4bfd18f5..d19657cf 100644
--- a/private_gpt/server/recipes/summarize/summarize_service.py
+++ b/private_gpt/server/recipes/summarize/summarize_service.py
@@ -90,9 +90,9 @@ class SummarizeService:
         # Add context documents to summarize
         if use_context:
             # 1. Recover all ref docs
-            ref_docs: dict[
-                str, RefDocInfo
-            ] | None = self.storage_context.docstore.get_all_ref_doc_info()
+            ref_docs: dict[str, RefDocInfo] | None = (
+                self.storage_context.docstore.get_all_ref_doc_info()
+            )
             if ref_docs is None:
                 raise ValueError("No documents have been ingested yet.")
 
diff --git a/private_gpt/settings/settings.py b/private_gpt/settings/settings.py
index 4cf192a3..5781a386 100644
--- a/private_gpt/settings/settings.py
+++ b/private_gpt/settings/settings.py
@@ -136,19 +136,19 @@ class LLMSettings(BaseModel):
         0.1,
         description="The temperature of the model. Increasing the temperature will make the model answer more creatively. A value of 0.1 would be more factual.",
     )
-    prompt_style: Literal[
-        "default", "llama2", "llama3", "tag", "mistral", "chatml"
-    ] = Field(
-        "llama2",
-        description=(
-            "The prompt style to use for the chat engine. "
-            "If `default` - use the default prompt style from the llama_index. It should look like `role: message`.\n"
-            "If `llama2` - use the llama2 prompt style from the llama_index. Based on `<s>`, `[INST]` and `<<SYS>>`.\n"
-            "If `llama3` - use the llama3 prompt style from the llama_index."
-            "If `tag` - use the `tag` prompt style. It should look like `<|role|>: message`. \n"
-            "If `mistral` - use the `mistral prompt style. It shoudl look like <s>[INST] {System Prompt} [/INST]</s>[INST] { UserInstructions } [/INST]"
-            "`llama2` is the historic behaviour. `default` might work better with your custom models."
-        ),
+    prompt_style: Literal["default", "llama2", "llama3", "tag", "mistral", "chatml"] = (
+        Field(
+            "llama2",
+            description=(
+                "The prompt style to use for the chat engine. "
+                "If `default` - use the default prompt style from the llama_index. It should look like `role: message`.\n"
+                "If `llama2` - use the llama2 prompt style from the llama_index. Based on `<s>`, `[INST]` and `<<SYS>>`.\n"
+                "If `llama3` - use the llama3 prompt style from the llama_index."
+                "If `tag` - use the `tag` prompt style. It should look like `<|role|>: message`. \n"
+                "If `mistral` - use the `mistral prompt style. It shoudl look like <s>[INST] {System Prompt} [/INST]</s>[INST] { UserInstructions } [/INST]"
+                "`llama2` is the historic behaviour. `default` might work better with your custom models."
+            ),
+        )
     )
 
 
diff --git a/private_gpt/ui/ui.py b/private_gpt/ui/ui.py
index 2c1dcd3e..5b945904 100644
--- a/private_gpt/ui/ui.py
+++ b/private_gpt/ui/ui.py
@@ -1,4 +1,5 @@
 """This file should be imported if and only if you want to run the UI locally."""
+
 import base64
 import logging
 import time