diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index 0495cc7..4456d62 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -403,7 +403,7 @@
 .. _`Whirlpool website`: http://www.larc.usp.br/~pbarreto/WhirlpoolPage.html
 .. _`draft RFC`: https://tools.ietf.org/html/draft-josefsson-scrypt-kdf-01
 .. _`Specification repository`: https://github.com/fernet/spec
-.. _`errata`: http://www.rfc-editor.org/errata_search.php?rfc=6238
+.. _`errata`: https://www.rfc-editor.org/errata_search.php?rfc=6238
 .. _`OpenSSL example key`: https://github.com/openssl/openssl/blob/d02b48c63a58ea4367a0e905979f140b7d090f86/test/testrsa.pem
 .. _`GnuTLS key parsing tests`: https://gitlab.com/gnutls/gnutls/commit/f16ef39ef0303b02d7fa590a37820440c466ce8d
 .. _`enc-rsa-pkcs8.pem`: https://gitlab.com/gnutls/gnutls/blob/f8d943b38bf74eaaa11d396112daf43cb8aa82ae/tests/pkcs8-decode/encpkcs8.pem
diff --git a/docs/hazmat/primitives/mac/index.rst b/docs/hazmat/primitives/mac/index.rst
index bc54bae..05db708 100644
--- a/docs/hazmat/primitives/mac/index.rst
+++ b/docs/hazmat/primitives/mac/index.rst
@@ -9,7 +9,7 @@
 For more information on why HMAC is preferred, see `Use cases for CMAC vs.
 HMAC?`_
 
-.. _`Use cases for CMAC vs. HMAC?`: http://crypto.stackexchange.com/questions/15721/use-cases-for-cmac-vs-hmac
+.. _`Use cases for CMAC vs. HMAC?`: https://crypto.stackexchange.com/questions/15721/use-cases-for-cmac-vs-hmac
 
 .. toctree::
     :maxdepth: 1
diff --git a/docs/installation.rst b/docs/installation.rst
index 2f97885..928ed4e 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -202,7 +202,7 @@
 
 
 .. _`Homebrew`: http://brew.sh
-.. _`MacPorts`: http://www.macports.org
+.. _`MacPorts`: https://www.macports.org
 .. _`32-bit`: https://jenkins.cryptography.io/job/openssl-win32-release/
 .. _`64-bit`: https://jenkins.cryptography.io/job/openssl-win64-release/
 .. _`bug in conda`: https://github.com/conda/conda-recipes/issues/110