diff --git a/content/notebooks/2016-2-26-profitability-using-the-investment-formula.ipynb b/content/notebooks/2016-2-26-profitability-using-the-investment-formula.ipynb
index a687fb7..3716140 100644
--- a/content/notebooks/2016-2-26-profitability-using-the-investment-formula.ipynb
+++ b/content/notebooks/2016-2-26-profitability-using-the-investment-formula.ipynb
@@ -52,7 +52,7 @@
     "import matplotlib.pyplot as plt\n",
     "from Quandl import get as qget\n",
     "%matplotlib inline\n",
-    "api_key = 'QUJUp-dAKyo2y8DGsCv-'\n",
+    "api_key = ''\n",
     "\n",
     "profitability = lambda p, i, m, d: 1000*p / (m + i*d)\n",
     "\n",