diff --git a/doc/source/conf.py b/doc/source/conf.py
index e8d825a509be9..2db09841db2f8 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -413,7 +413,7 @@
         "py": ("https://pylib.readthedocs.io/en/latest/", None),
         "python": ("https://docs.python.org/3/", None),
         "scipy": ("https://docs.scipy.org/doc/scipy/reference/", None),
-        "statsmodels": ("http://www.statsmodels.org/devel/", None),
+        "statsmodels": ("https://www.statsmodels.org/devel/", None),
     }
 
 # extlinks alias