diff --git a/doc/source/installation/installation.rst b/doc/source/installation/installation.rst
index 5301f59d486d238000331381e89f937474236575..d4b5b79a0a66022344b99e20ef90d18f35476100 100644
--- a/doc/source/installation/installation.rst
+++ b/doc/source/installation/installation.rst
@@ -252,7 +252,7 @@ named `__init__.py`, so that python recognizes it as a module::
     touch __init__.py
 
 Then copy all needed data files from the
-`NIST website <http://kinetics.nist.gov/janaf/>`_
+`NIST website <https://janaf.nist.gov/>`_
 in the tab-delimited text format
 to the `janaf_data` directory. To download the ASCII file,
 search for your molecule. In the results page click on 'view'
diff --git a/kmcos/species.py b/kmcos/species.py
index 07591730514f9f7bd0cfc1bfec8209dc18c67ab3..6a1b399c995f37b6ed69f9978fe8559738bc4264 100644
--- a/kmcos/species.py
+++ b/kmcos/species.py
@@ -58,7 +58,7 @@ janaf_warning_string = str("""
             touch __init__.py
 
             Then copy all needed data files from the
-            `NIST website <http://kinetics.nist.gov/janaf/>`_
+            `NIST website <https://janaf.nist.gov/>`_
             in the tab-delimited text format
             to the `janaf_data` directory.""")
 try: