diff --git a/doc/build-openbsd.md b/doc/build-openbsd.md
--- a/doc/build-openbsd.md
+++ b/doc/build-openbsd.md
@@ -48,7 +48,7 @@
 mkdir -p $BOOST_PREFIX
 
 # Fetch the source and verify that it is not tampered with
-curl -o boost_1_61_0.tar.bz2 http://heanet.dl.sourceforge.net/project/boost/boost/1.61.0/boost_1_61_0.tar.bz2
+curl -o boost_1_61_0.tar.bz2 https://kent.dl.sourceforge.net/project/boost/boost/1.61.0/boost_1_61_0.tar.bz2
 echo 'a547bd06c2fd9a71ba1d169d9cf0339da7ebf4753849a8f7d6fdb8feee99b640  boost_1_61_0.tar.bz2' | sha256 -c
 # MUST output: (SHA256) boost_1_61_0.tar.bz2: OK
 tar -xjf boost_1_61_0.tar.bz2
@@ -79,7 +79,7 @@
 mkdir -p $BDB_PREFIX
 
 # Fetch the source and verify that it is not tampered with
-curl -o db-6.2.32.NC.tar.gz 'http://download.oracle.com/berkeley-db/db-6.2.32.NC.tar.gz'
+curl -o db-6.2.32.NC.tar.gz 'https://download.oracle.com/berkeley-db/db-6.2.32.NC.tar.gz'
 echo 'd86cf1283c519d42dd112b4501ecb2db11ae765b37a1bdad8f8cb06b0ffc69b8  db-6.2.32.NC.tar.gz' | sha256sum -c
 # MUST output: (SHA256) db-6.2.32.NC.tar.gz: OK
 tar -xzf db-6.2.32.NC.tar.gz
diff --git a/doc/gitian-building.md b/doc/gitian-building.md
--- a/doc/gitian-building.md
+++ b/doc/gitian-building.md
@@ -43,7 +43,7 @@
  - A machine with at least 64b of disk space
  - 16GB of RAM
  - Several installed tools:
-   - [Vagrant](http://vagrantup.com)
+   - [Vagrant](https://www.vagrantup.com)
    - [Packer](https://www.packer.io)
    - [Virtualbox](https://www.virtualbox.org)