diff --git a/docs/development/custom-vectors/idea.rst b/docs/development/custom-vectors/idea.rst
index 336cdf0..758a108 100644
--- a/docs/development/custom-vectors/idea.rst
+++ b/docs/development/custom-vectors/idea.rst
@@ -29,4 +29,4 @@
 Download link: :download:`verify_idea.py
 </development/custom-vectors/idea/verify_idea.py>`
 
-.. _`Botan`: http://botan.randombit.net
+.. _`Botan`: https://botan.randombit.net
diff --git a/docs/development/custom-vectors/seed.rst b/docs/development/custom-vectors/seed.rst
index 290fb77..8c4a7aa 100644
--- a/docs/development/custom-vectors/seed.rst
+++ b/docs/development/custom-vectors/seed.rst
@@ -29,4 +29,4 @@
 Download link: :download:`verify_seed.py
 </development/custom-vectors/seed/verify_seed.py>`
 
-.. _`Botan`: http://botan.randombit.net
+.. _`Botan`: https://botan.randombit.net
diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index 4f0ece5..3429d52 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -427,7 +427,7 @@
     # Verified against the CommonCrypto and Go crypto packages
     # Key Length : 128
 
-.. _`NIST`: http://www.nist.gov/
+.. _`NIST`: https://www.nist.gov/
 .. _`IETF`: https://www.ietf.org/
 .. _`NIST CAVP`: http://csrc.nist.gov/groups/STM/cavp/
 .. _`Bruce Schneier's vectors`: https://www.schneier.com/code/vectors.txt
diff --git a/docs/hazmat/bindings/openssl.rst b/docs/hazmat/bindings/openssl.rst
index 8aef488..482cfaf 100644
--- a/docs/hazmat/bindings/openssl.rst
+++ b/docs/hazmat/bindings/openssl.rst
@@ -45,4 +45,4 @@
 
 .. _`CFFI`: https://cffi.readthedocs.io
 .. _`OpenSSL`: https://www.openssl.org/
-.. _`thread safety facilities`: https://www.openssl.org/docs/manmaster/crypto/threads.html
+.. _`thread safety facilities`: https://www.openssl.org/docs/man1.0.2/crypto/threads.html
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst
index 657e706..24b2c04 100644
--- a/docs/hazmat/primitives/symmetric-encryption.rst
+++ b/docs/hazmat/primitives/symmetric-encryption.rst
@@ -613,4 +613,4 @@
 .. _`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
+.. _`OpenPGP`: http://openpgp.org
diff --git a/docs/installation.rst b/docs/installation.rst
index 7f69f51..724c63d 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -248,7 +248,7 @@
 Building cryptography with conda
 --------------------------------
 
-Because of a `bug in conda`_, attempting to install cryptography out of the box
+Because of a bug in conda, attempting to install cryptography out of the box
 will result in an error. This can be resolved by setting the library path
 environment variable for your platform.
 
@@ -271,7 +271,6 @@
 .. _`Homebrew`: http://brew.sh
 .. _`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`: https://software-carpentry.org/blog/2014/04/mr-biczo-was-right.html
 .. _virtualenv: https://virtualenv.pypa.io/en/latest/
 .. _openssl.org: https://www.openssl.org/source/
diff --git a/docs/random-numbers.rst b/docs/random-numbers.rst
index 5f94bf1..8c6b9fd 100644
--- a/docs/random-numbers.rst
+++ b/docs/random-numbers.rst
@@ -29,4 +29,4 @@
 
     >>> serial = int.from_bytes(os.urandom(20), byteorder="big")
 
-.. _`always use your operating system's provided random number generator`: http://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers/
+.. _`always use your operating system's provided random number generator`: https://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers/