diff --git a/_posts/01-05-01-Windows-Setup.md b/_posts/01-05-01-Windows-Setup.md
index 53a954a..94b251c 100644
--- a/_posts/01-05-01-Windows-Setup.md
+++ b/_posts/01-05-01-Windows-Setup.md
@@ -25,7 +25,7 @@ Chris Tankersley has a very helpful blog post on what tools he uses to do [PHP d
 
 [easyphp]: https://www.easyphp.org/
 [phpmanager]: http://phpmanager.codeplex.com/
-[openserver]: http://open-server.ru/
+[openserver]: https://ospanel.io/
 [wamp]: https://www.wampserver.com/en/
 [php-downloads]: https://windows.php.net/download/
 [php-iis]: https://php.iis.net/
diff --git a/_posts/05-06-01-Internationalization-and-Localization.md b/_posts/05-06-01-Internationalization-and-Localization.md
index 8ed02dd..a860695 100644
--- a/_posts/05-06-01-Internationalization-and-Localization.md
+++ b/_posts/05-06-01-Internationalization-and-Localization.md
@@ -417,7 +417,7 @@ After including those new rules in the `.po` file, a new scan will bring in your
 [laravel]: https://laravel.com/docs/master/localization
 [yii]: https://www.yiiframework.com/doc/guide/2.0/en/tutorial-i18n
 [intl]: https://secure.php.net/manual/intro.intl.php
-[ICU project]: http://www.icu-project.org
+[ICU project]: https://icu.unicode.org/
 [symfony-keys]: https://symfony.com/doc/current/components/translation/usage.html#creating-translations
 
 [sprintf]: https://secure.php.net/manual/function.sprintf.php
diff --git a/_posts/11-02-01-Test-Driven-Development.md b/_posts/11-02-01-Test-Driven-Development.md
index f4d3e5b..bd7f666 100644
--- a/_posts/11-02-01-Test-Driven-Development.md
+++ b/_posts/11-02-01-Test-Driven-Development.md
@@ -62,7 +62,7 @@ users of the application.
 
 #### Functional Testing Tools
 
-* [Selenium](https://docs.seleniumhq.org/)
+* [Selenium](https://www.selenium.dev/)
 * [Mink](https://mink.behat.org/)
 * [Codeception](https://codeception.com/) is a full-stack testing framework that includes acceptance testing tools
 * [Storyplayer](https://datasift.github.io/storyplayer/) is a full-stack testing framework that includes support for creating and destroying test environments on demand
diff --git a/_posts/11-04-01-Complementary-Testing-Tools.md b/_posts/11-04-01-Complementary-Testing-Tools.md
index d0ff637..92d97cd 100644
--- a/_posts/11-04-01-Complementary-Testing-Tools.md
+++ b/_posts/11-04-01-Complementary-Testing-Tools.md
@@ -19,7 +19,7 @@ libraries useful for any preferred approach taken.
 * [PHPUnit Polyfills] is a library that allows for creating PHPUnit cross-version compatible tests when a test suite needs to run against a range of PHPUnit versions.
 
 
-[Selenium]: https://www.seleniumhq.org/
+[Selenium]: https://www.selenium.dev/
 [integrated with PHPUnit]: https://github.com/giorgiosironi/phpunit-selenium/
 [Mockery]: https://github.com/padraic/mockery
 [PHPUnit]: https://phpunit.de/
diff --git a/_posts/12-05-01-Building-your-Application.md b/_posts/12-05-01-Building-your-Application.md
index 760d372..4cd9c31 100644
--- a/_posts/12-05-01-Building-your-Application.md
+++ b/_posts/12-05-01-Building-your-Application.md
@@ -94,7 +94,7 @@ PHP.
 [Chef_cookbook]: https://github.com/chef-cookbooks/php
 [Chef_tutorial]: https://www.youtube.com/playlist?list=PL11cZfNdwNyPnZA9D1MbVqldGuOWqbumZ
 [apache_ant_tutorial]: https://code.tutsplus.com/tutorials/automate-your-projects-with-apache-ant--net-18595
-[Travis CI]: https://travis-ci.org/
+[Travis CI]: https://www.travis-ci.com/
 [Jenkins]: https://jenkins.io/
 [PHPCI]: https://github.com/dancryer/phpci
 [PHP Censor]: https://github.com/php-censor/php-censor