diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index 5bb4eef..e461892 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -425,7 +425,7 @@
 .. _`NIST CAVP`: http://csrc.nist.gov/groups/STM/cavp/
 .. _`Bruce Schneier's vectors`: https://www.schneier.com/code/vectors.txt
 .. _`Camellia page`: https://info.isl.ntt.co.jp/crypt/eng/camellia/
-.. _`CRYPTREC`: http://www.cryptrec.go.jp
+.. _`CRYPTREC`: https://www.cryptrec.go.jp
 .. _`OpenSSL's test vectors`: https://github.com/openssl/openssl/blob/97cf1f6c2854a3a955fd7dd3a1f113deba00c9ef/crypto/evp/evptests.txt#L232
 .. _`RIPEMD website`: http://homes.esat.kuleuven.be/~bosselae/ripemd160.html
 .. _`Whirlpool website`: http://www.larc.usp.br/~pbarreto/WhirlpoolPage.html
diff --git a/docs/hazmat/primitives/asymmetric/ec.rst b/docs/hazmat/primitives/asymmetric/ec.rst
index 8e3a365..b32d331 100644
--- a/docs/hazmat/primitives/asymmetric/ec.rst
+++ b/docs/hazmat/primitives/asymmetric/ec.rst
@@ -505,7 +505,7 @@
 .. _`less than 224 bits`: http://www.ecrypt.eu.org/ecrypt2/documents/D.SPA.20.pdf
 .. _`elliptic curve diffie-hellman is faster than diffie-hellman`: http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1100&context=cseconfwork
 .. _`minimize the number of security concerns for elliptic-curve cryptography`: https://cr.yp.to/ecdh/curve25519-20060209.pdf
-.. _`SafeCurves`: http://safecurves.cr.yp.to/
+.. _`SafeCurves`: https://safecurves.cr.yp.to/
 .. _`ECDSA`: https://en.wikipedia.org/wiki/ECDSA
 .. _`EdDSA`: https://en.wikipedia.org/wiki/EdDSA
 .. _`forward secrecy`: https://en.wikipedia.org/wiki/Forward_secrecy
diff --git a/docs/hazmat/primitives/asymmetric/rsa.rst b/docs/hazmat/primitives/asymmetric/rsa.rst
index 1e18915..c2a6d43 100644
--- a/docs/hazmat/primitives/asymmetric/rsa.rst
+++ b/docs/hazmat/primitives/asymmetric/rsa.rst
@@ -660,6 +660,6 @@
 .. _`at least 2048`: http://www.ecrypt.eu.org/ecrypt2/documents/D.SPA.20.pdf
 .. _`OpenPGP`: https://en.wikipedia.org/wiki/Pretty_Good_Privacy
 .. _`Chinese Remainder Theorem`: https://en.wikipedia.org/wiki/RSA_%28cryptosystem%29#Using_the_Chinese_remainder_algorithm
-.. _`security proof`: http://eprint.iacr.org/2001/062.pdf
+.. _`security proof`: https://eprint.iacr.org/2001/062.pdf
 .. _`recommended padding algorithm`: http://www.daemonology.net/blog/2009-06-11-cryptographic-right-answers.html
 .. _`proven secure`: https://cseweb.ucsd.edu/~mihir/papers/oae.pdf
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst
index d588489..7b00d11 100644
--- a/docs/hazmat/primitives/symmetric-encryption.rst
+++ b/docs/hazmat/primitives/symmetric-encryption.rst
@@ -610,7 +610,7 @@
 .. _`NIST SP-800-38D`: http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
 .. _`Communications Security Establishment`: https://www.cse-cst.gc.ca
 .. _`encrypt`: https://ssd.eff.org/en/module/what-encryption
-.. _`CRYPTREC`: http://www.cryptrec.go.jp/english/
+.. _`CRYPTREC`: https://www.cryptrec.go.jp/english/
 .. _`significant patterns in the output`: https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_Codebook_.28ECB.29
 .. _`International Data Encryption Algorithm`: https://en.wikipedia.org/wiki/International_Data_Encryption_Algorithm
 .. _`OpenPGP`: http://www.openpgp.org
diff --git a/docs/installation.rst b/docs/installation.rst
index 1804989..8c3c436 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -268,7 +268,7 @@
 .. _`MacPorts`: https://www.macports.org
 .. _`openssl-release`: https://jenkins.cryptography.io/job/openssl-release/
 .. _`bug in conda`: https://github.com/conda/conda-recipes/issues/110
-.. _`Greg Wilson's blog post`: http://software-carpentry.org/blog/2014/04/mr-biczo-was-right.html
+.. _`Greg Wilson's blog post`: https://software-carpentry.org/blog/2014/04/mr-biczo-was-right.html
 .. _virtualenv: https://virtualenv.pypa.io/en/latest/
 .. _openssl.org: https://openssl.org/source/
 .. _`wheel cache`: https://pip.pypa.io/en/stable/reference/pip_install/#caching