diff --git a/index.toml b/index.toml
index 330b4f9..b8a0abb 100644
--- a/index.toml
+++ b/index.toml
@@ -158,7 +158,7 @@ notebook = "40_Building_Chat_Application_with_Function_Calling.ipynb"
 aliases = []
 completion_time = "20 min"
 created_at = 2024-03-05
-dependencies = ["sentence-transformers>=4.1.0", "gradio"]
+dependencies = ["sentence-transformers>=4.1.0", "gradio", "pytz"]
 
 [[tutorial]]
 title = "Query Classification with TransformersTextRouter and TransformersZeroShotTextRouter"
diff --git a/tutorials/40_Building_Chat_Application_with_Function_Calling.ipynb b/tutorials/40_Building_Chat_Application_with_Function_Calling.ipynb
index f99f746..92672b0 100644
--- a/tutorials/40_Building_Chat_Application_with_Function_Calling.ipynb
+++ b/tutorials/40_Building_Chat_Application_with_Function_Calling.ipynb
@@ -733,7 +733,7 @@
    "source": [
     "%%bash\n",
     "\n",
-    "pip install -U gradio"
+    "pip install -U gradio pytz"
    ]
   },
   {
@@ -745,7 +745,6 @@
    "outputs": [],
    "source": [
     "import gradio as gr\n",
-    "import json\n",
     "\n",
     "from haystack.dataclasses import ChatMessage\n",
     "from haystack.components.generators.chat import OpenAIChatGenerator\n",