Colin's website went HTTPS! (#4515)
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst
index c933d04..cd4059f 100644
--- a/docs/hazmat/primitives/symmetric-encryption.rst
+++ b/docs/hazmat/primitives/symmetric-encryption.rst
@@ -803,7 +803,7 @@
-.. _`described by Colin Percival`: http://www.daemonology.net/blog/2009-06-11-cryptographic-right-answers.html
+.. _`described by Colin Percival`: https://www.daemonology.net/blog/2009-06-11-cryptographic-right-answers.html
.. _`recommends a 96-bit IV length`: https://csrc.nist.gov/publications/detail/sp/800-38d/final
.. _`NIST SP-800-38D`: https://csrc.nist.gov/publications/detail/sp/800-38d/final
.. _`Communications Security Establishment`: https://www.cse-cst.gc.ca