diff --git a/README.md b/README.md
index d758a4e2d5..67d9085d08 100644
--- a/README.md
+++ b/README.md
@@ -160,7 +160,7 @@ Dress :)
 [#regenerating-a-test-suite]: #regenerating-a-test-suite
 [#ruby-icon]: #ruby-icon
 [#running-the-tests]: #running-the-tests
-[rubocop]: http://batsov.com/rubocop/
+[rubocop]: https://batsov.com/rubocop/
 [#setup]: #setup
 [#style-guide]: #style-guide
 [synchronize]: https://help.github.com/articles/syncing-a-fork/
diff --git a/concepts/instance-variables/about.md b/concepts/instance-variables/about.md
index cb225a401d..a38aa4c19a 100644
--- a/concepts/instance-variables/about.md
+++ b/concepts/instance-variables/about.md
@@ -59,7 +59,7 @@ end
 - [Mix & Go: Ruby's attr_accessor, attr_reader, attr_writer][mg-attr]
 
 [mg-attr]: https://mixandgo.com/learn/ruby_attr_accessor_attr_reader_attr_writer
-[rfb-instance-variables]: http://ruby-for-beginners.rubymonstas.org/writing_classes/instance_variables.html
+[rfb-instance-variables]: https://ruby-for-beginners.rubymonstas.org/writing_classes/instance_variables.html
 [rg-initialize-method]: https://www.rubyguides.com/2019/01/ruby-initialize-method/
 [rg-instance-variables]: https://www.rubyguides.com/2019/07/ruby-instance-variables/
 [rug-instance-variables]: https://ruby-doc.org/docs/ruby-doc-bundle/UsersGuide/rg/instancevars.html
diff --git a/concepts/instance-variables/links.json b/concepts/instance-variables/links.json
index 42d0ff212c..e8d92e12a5 100644
--- a/concepts/instance-variables/links.json
+++ b/concepts/instance-variables/links.json
@@ -4,7 +4,7 @@
     "description": "rg-initialize-method"
   },
   {
-    "url": "http://ruby-for-beginners.rubymonstas.org/writing_classes/instance_variables.html",
+    "url": "https://ruby-for-beginners.rubymonstas.org/writing_classes/instance_variables.html",
     "description": "rfb-instance-variables"
   },
   {
diff --git a/concepts/nil/links.json b/concepts/nil/links.json
index 42d0ff212c..e8d92e12a5 100644
--- a/concepts/nil/links.json
+++ b/concepts/nil/links.json
@@ -4,7 +4,7 @@
     "description": "rg-initialize-method"
   },
   {
-    "url": "http://ruby-for-beginners.rubymonstas.org/writing_classes/instance_variables.html",
+    "url": "https://ruby-for-beginners.rubymonstas.org/writing_classes/instance_variables.html",
     "description": "rfb-instance-variables"
   },
   {
diff --git a/concepts/strings/about.md b/concepts/strings/about.md
index 99244bc775..5674eb5518 100644
--- a/concepts/strings/about.md
+++ b/concepts/strings/about.md
@@ -8,6 +8,6 @@ Single-quoted strings don't process ASCII escape codes(\n, \t etc.), and they do
 
 You can also create strings using the [heredoc syntax][ruby-heredoc] or using the `%q` and `%Q` helpers.
 
-[ruby-for-beginners.rubymonstas.org-interpolation]: http://ruby-for-beginners.rubymonstas.org/bonus/string_interpolation.html
+[ruby-for-beginners.rubymonstas.org-interpolation]: https://ruby-for-beginners.rubymonstas.org/bonus/string_interpolation.html
 [ruby-doc.org-string]: https://docs.ruby-lang.org/en/master/String.html
 [ruby-heredoc]: https://www.rubyguides.com/2018/11/ruby-heredoc/
diff --git a/concepts/strings/links.json b/concepts/strings/links.json
index f351dd449e..1182d16440 100644
--- a/concepts/strings/links.json
+++ b/concepts/strings/links.json
@@ -4,7 +4,7 @@
     "description": "ruby-doc.org-string"
   },
   {
-    "url": "http://ruby-for-beginners.rubymonstas.org/bonus/string_interpolation.html",
+    "url": "https://ruby-for-beginners.rubymonstas.org/bonus/string_interpolation.html",
     "description": "ruby-for-beginners.rubymonstas.org-interpolation"
   },
   {
diff --git a/docs/LEARNING.md b/docs/LEARNING.md
index 71f79f31c5..b1b5a7ad36 100644
--- a/docs/LEARNING.md
+++ b/docs/LEARNING.md
@@ -3,10 +3,10 @@
 Exercism provides exercises and feedback but can be difficult to jump into for those learning Ruby for the first time. These resources can help you get started:
 
 * [Ruby in Twenty Minutes](https://www.ruby-lang.org/en/documentation/quickstart/)
-* [Ruby Documentation](http://ruby-doc.org/)
-* [RubyLearning.com (on wayback machine)](http://web.archive.org/web/20210813230808/https://rubylearning.com/) - Ruby Tutorial and Study Notes
-* [Learn to Program](http://pine.fm/LearnToProgram/) - A book (available online) written by Chris Pine
-* [StackOverflow](http://stackoverflow.com/questions/tagged/ruby)
+* [Ruby Documentation](https://ruby-doc.org/)
+* [RubyLearning)](https://rubylearning.github.io/) - Ruby Tutorial and Study Notes
+* [Learn to Program](https://pine.fm/LearnToProgram/) - A book (available online) written by Chris Pine
+* [StackOverflow](https://stackoverflow.com/questions/tagged/ruby)
 * [RubyMonk](https://rubymonk.com/)
-* [Learn Ruby The Hard Way](http://learnrubythehardway.org/book/)
+* [Learn Ruby The Hard Way](https://learnrubythehardway.org/book/)
 * [Codecademy.org's Ruby Course](https://www.codecademy.com/learn/ruby)
diff --git a/docs/RESOURCES.md b/docs/RESOURCES.md
index 3610e39e52..0b113d0c0e 100644
--- a/docs/RESOURCES.md
+++ b/docs/RESOURCES.md
@@ -3,11 +3,11 @@
 ## Environment
 * [Ruby](https://www.ruby-lang.org/)
 * [Ruby Gems](https://rubygems.org/)
-* [Bundler](http://bundler.io/)
+* [Bundler](https://bundler.io/)
 * [RVM](https://rvm.io/)
 * [rbenv](https://github.com/rbenv/rbenv)
 
 ## Docs
-* [Ruby Doc](http://ruby-doc.org/)
-* [API Dock](http://apidock.com/)
-* [Minitest](http://docs.seattlerb.org/minitest/)
+* [Ruby Doc](https://ruby-doc.org/)
+* [API Dock](https://apidock.com/)
+* [Minitest](https://docs.seattlerb.org/minitest/)