diff --git a/ml2/3_1_Read_Data.ipynb b/ml2/3_1_Read_Data.ipynb
index 44f8fa7..8756c30 100644
--- a/ml2/3_1_Read_Data.ipynb
+++ b/ml2/3_1_Read_Data.ipynb
@@ -213,8 +213,8 @@
     "* [Pandas API input-output](http://pandas.pydata.org/pandas-docs/stable/api.html#input-output)\n",
     "* [Pandas API - pandas.read_csv](http://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_csv.html)\n",
     "* [DataFrame](http://pandas.pydata.org/pandas-docs/stable/dsintro.html)\n",
-    "* [An introduction to NumPy and Scipy](http://www.engr.ucsb.edu/~shell/che210d/numpy.pdf)\n",
-    "* [NumPy tutorial](https://docs.scipy.org/doc/numpy-dev/user/quickstart.html)"
+    "* [An introduction to NumPy and Scipy](https://sites.engineering.ucsb.edu/~shell/che210d/numpy.pdf)\n",
+    "* [NumPy tutorial](https://numpy.org/doc/stable/)"
    ]
   },
   {