diff --git a/source/references.rst b/source/references.rst
index eed0dac..3631724 100644
--- a/source/references.rst
+++ b/source/references.rst
@@ -58,4 +58,4 @@ Bibliography
 
 .. [TCG2] `TCG EFI Protocol Specification, Family “2.0”, Level 00 Revision 00.13.
    <https://trustedcomputinggroup.org/wp-content/uploads/EFI-Protocol-Specification-rev13-160330final.pdf>`_
-   March 2016, `Trusted Computing Group <http://www.trustedcomputinggroup.org/>`_
+   March 2016, `Trusted Computing Group <https://trustedcomputinggroup.org/>`_