diff --git a/_posts/01-04-01-Mac-Setup.md b/_posts/01-04-01-Mac-Setup.md
index 9032188..d4e905c 100644
--- a/_posts/01-04-01-Mac-Setup.md
+++ b/_posts/01-04-01-Mac-Setup.md
@@ -75,7 +75,7 @@ you and tie them all together, but ease of setup comes with a trade-off of flexi
 [Homebrew PHP]: https://github.com/Homebrew/homebrew-php#installation
 [MacPorts]: https://www.macports.org/install.php
 [phpbrew]: https://github.com/phpbrew/phpbrew
-[php-osx.liip.ch]: https://php-osx.liip.ch/
+[php-osx.liip.ch]: https://web.archive.org/web/20220505163210/https://php-osx.liip.ch/
 [mac-compile]: https://secure.php.net/install.macosx.compile
 [xcode-gcc-substitution]: https://github.com/kennethreitz/osx-gcc-installer
 ["Command Line Tools for XCode"]: https://developer.apple.com/downloads
diff --git a/_posts/01-05-01-Windows-Setup.md b/_posts/01-05-01-Windows-Setup.md
index 644cb57..9423546 100644
--- a/_posts/01-05-01-Windows-Setup.md
+++ b/_posts/01-05-01-Windows-Setup.md
@@ -31,4 +31,4 @@ Chris Tankersley has a very helpful blog post on what tools he uses to do [PHP d
 [php-iis]: https://php.iis.net/
 [windows-path]: https://www.windows-commandline.com/set-path-command-line/
 [windows-tools]: https://ctankersley.com/2016/11/13/developing-on-windows-2016/
-[xampp]: http://www.apachefriends.org/
+[xampp]: https://www.apachefriends.org/
diff --git a/_posts/07-03-01-Databases_PDO.md b/_posts/07-03-01-Databases_PDO.md
index 5c819f0..b11f9b8 100644
--- a/_posts/07-03-01-Databases_PDO.md
+++ b/_posts/07-03-01-Databases_PDO.md
@@ -72,6 +72,6 @@ unless of course you are using persistent connections.
 
 
 [pdo]: https://secure.php.net/pdo
-[SQL Injection]: http://wiki.hashphp.org/Validation
+[SQL Injection]: https://web.archive.org/web/20210413233627/http://wiki.hashphp.org/Validation
 [Learn about PDO]: https://secure.php.net/book.pdo
 [Learn about PDO connections]: https://secure.php.net/pdo.connections