diff --git a/doc/source/user_guide/style.ipynb b/doc/source/user_guide/style.ipynb
index f22a506499cf4..2d4b0f6a7545e 100644
--- a/doc/source/user_guide/style.ipynb
+++ b/doc/source/user_guide/style.ipynb
@@ -1280,7 +1280,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "You can create \"heatmaps\" with the `background_gradient` and `text_gradient` methods. These require matplotlib, and we'll use [Seaborn](http://seaborn.pydata.org/) to get a nice colormap."
+    "You can create \"heatmaps\" with the `background_gradient` and `text_gradient` methods. These require matplotlib, and we'll use [Seaborn](https://seaborn.pydata.org/) to get a nice colormap."
    ]
   },
   {