diff --git a/content/Building Systems with the ChatGPT API/5.Chain of Thought Reasoning.ipynb b/content/Building Systems with the ChatGPT API/5.Chain of Thought Reasoning.ipynb
index 9512dda..904f2aa 100644
--- a/content/Building Systems with the ChatGPT API/5.Chain of Thought Reasoning.ipynb	
+++ b/content/Building Systems with the ChatGPT API/5.Chain of Thought Reasoning.ipynb	
@@ -26,11 +26,10 @@
    "source": [
     "import os\n",
     "import openai\n",
-    "# from dotenv import load_dotenv, find_dotenv\n",
-    "# _ = load_dotenv(find_dotenv()) # read local .env file\n",
+    "from dotenv import load_dotenv, find_dotenv\n",
+    "_ = load_dotenv(find_dotenv()) # read local .env file\n",
     "\n",
-    "# openai.api_key  = os.environ['OPENAI_API_KEY']\n",
-    "openai.api_key = \"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\""
+    "openai.api_key  = os.environ['OPENAI_API_KEY']\n"
    ]
   },
   {