diff --git a/LICENSE.md b/LICENSE.md
index e107599..0e87b58 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -78,6 +78,6 @@ are registered trademarks of [NumFOCUS][numfocus].
 
 [cc-by-human]: https://creativecommons.org/licenses/by/4.0/
 [cc-by-legal]: https://creativecommons.org/licenses/by/4.0/legalcode
-[mit-license]: http://opensource.org/licenses/mit-license.html
-[numfocus]: http://numfocus.org/
-[osi]: http://opensource.org
+[mit-license]: https://opensource.org/licenses/mit-license.html
+[numfocus]: https://numfocus.org/
+[osi]: https://opensource.org
diff --git a/_includes/lc/syllabus.html b/_includes/lc/syllabus.html
index 4dc2077..e2c7012 100644
--- a/_includes/lc/syllabus.html
+++ b/_includes/lc/syllabus.html
@@ -8,7 +8,7 @@ <h3 id="syllabus-python">Data Intro</h3>
       <li>Plain text formats</li>
       <li>Naming files</li>
       <li>Regular expressions</li>
-      <li><a href="http://data-lessons.github.io/library-data-intro/reference/">Reference...</a></li>
+      <li><a href="https://data-lessons.github.io/library-data-intro/reference/">Reference...</a></li>
     </ul>
   </div>
   <div class="col-md-6">
@@ -19,7 +19,7 @@ <h3 id="syllabus-shell">The Unix Shell</h3>
       <li>Counting and sorting contents in files</li>
       <li>Pipes and redirection</li>
       <li>Mining or searching in files</li>
-      <li><a href="http://data-lessons.github.io/library-shell/reference/">Reference...</a></li>
+      <li><a href="https://data-lessons.github.io/library-shell/reference/">Reference...</a></li>
     </ul>
   </div>
 
@@ -35,7 +35,7 @@ <h3 id="syllabus-git">Version Control with Git</h3>
       <li>Viewing state changes with <code>status</code></li>
       <li>Working on the web: <code>clone</code>, <code>pull</code>, <code>push</code>, ...</li>
       <li>Where to host work, and why</li>
-      <li><a href="http://data-lessons.github.io/library-git/reference">Reference...</a></li>
+      <li><a href="https://data-lessons.github.io/library-git/reference">Reference...</a></li>
     </ul>
   </div>
   <div class="col-md-6">
@@ -46,7 +46,7 @@ <h3 id="syllabus-r">Open Refine</h3>
         <li>Importing data</li>
         <li>Basic functions</li>
         <li>Advanced Functions</li>
-        <li><a href="http://data-lessons.github.io/library-openrefine/reference">Reference...</a></li>
+        <li><a href="https://data-lessons.github.io/library-openrefine/reference">Reference...</a></li>
       </ul>
     </div>
   </div>
@@ -62,7 +62,7 @@ <h3 id="syllabus-sql">SQL Intro</h3>
       <li>Filtering with <code>where</code></li>
       <li>Combining values using aggregation</li>
       <li>Combining information from multiple tables using <code>join</code></li>
-      <li><a href="http://data-lessons.github.io//library-sql/reference/">Reference...</a></li>
+      <li><a href="https://data-lessons.github.io//library-sql/reference/">Reference...</a></li>
     </ul>
   </div>
 </div>
diff --git a/_includes/links.md b/_includes/links.md
index 71ee7ee..2dfecd6 100644
--- a/_includes/links.md
+++ b/_includes/links.md
@@ -1,8 +1,8 @@
 [cc-by-human]: https://creativecommons.org/licenses/by/4.0/
 [cc-by-legal]: https://creativecommons.org/licenses/by/4.0/legalcode
-[concept-maps]: http://carpentries.github.io/instructor-training/05-memory/
+[concept-maps]: https://carpentries.github.io/instructor-training/05-memory/
 [email]: mailto:lessons@software-carpentry.org
-[contrib-covenant]: http://contributor-covenant.org/
+[contrib-covenant]: https://contributor-covenant.org/
 [contributing]: {{ site.github.repository_url }}/blob/gh-pages/CONTRIBUTING.md
 [cran-checkpoint]: https://cran.r-project.org/web/packages/checkpoint/index.html
 [cran-knitr]: https://cran.r-project.org/web/packages/knitr/index.html
@@ -14,10 +14,10 @@
 [jekyll-windows]: http://jekyll-windows.juthilo.com/
 [jekyll]: https://jekyllrb.com/
 [jupyter]: https://jupyter.org/
-[mit-license]: http://opensource.org/licenses/mit-license.html
+[mit-license]: https://opensource.org/licenses/mit-license.html
 [morea]: https://morea-framework.github.io/
-[numfocus]: http://numfocus.org/
-[osi]: http://opensource.org
+[numfocus]: https://numfocus.org/
+[osi]: https://opensource.org
 [pandoc]: https://pandoc.org/
 [paper-now]: https://github.com/PeerJ/paper-now
 [python-gapminder]: https://swcarpentry.github.io/python-novice-gapminder/
@@ -25,10 +25,10 @@
 [r-markdown]: http://rmarkdown.rstudio.com/
 [rstudio]: https://www.rstudio.com/
 [ruby-install-guide]: https://www.ruby-lang.org/en/downloads/
-[ruby-installer]: http://rubyinstaller.org/
+[ruby-installer]: https://rubyinstaller.org/
 [rubygems]: https://rubygems.org/pages/download/
 [styles]: https://github.com/swcarpentry/styles/
-[training]: http://swcarpentry.github.io/instructor-training/
+[training]: https://swcarpentry.github.io/instructor-training/
 [workshop-repo]: {{ site.workshop_repo }}
 [yaml]: http://yaml.org/
 [coc]: https://software-carpentry.org/conduct/
diff --git a/bin/lesson_initialize.py b/bin/lesson_initialize.py
index c513c52..7577796 100755
--- a/bin/lesson_initialize.py
+++ b/bin/lesson_initialize.py
@@ -158,15 +158,15 @@
 [dc-lessons]: http://datacarpentry.org/lessons/
 [dc-site]: http://datacarpentry.org/
 [discuss-list]: http://lists.software-carpentry.org/listinfo/discuss
-[github]: http://github.com
+[github]: https://github.com
 [github-flow]: https://guides.github.com/introduction/flow/
 [github-join]: https://github.com/join
 [how-contribute]: https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github
 [issues]: https://github.com/swcarpentry/FIXME/issues/
 [repo]: https://github.com/swcarpentry/FIXME/
 [swc-issues]: https://github.com/issues?q=user%3Aswcarpentry
-[swc-lessons]: http://software-carpentry.org/lessons/
-[swc-site]: http://software-carpentry.org/
+[swc-lessons]: https://software-carpentry.org/lessons/
+[swc-site]: https://software-carpentry.org/
 '''
 
 ROOT_CONFIG_YML = '''\
@@ -202,7 +202,7 @@
 swc_github: "https://github.com/swcarpentry"
 swc_site: "https://software-carpentry.org"
 swc_pages: "https://swcarpentry.github.io"
-lc_site: "http://librarycarpentry.github.io/"
+lc_site: "https://librarycarpentry.github.io/"
 template_repo: "https://github.com/swcarpentry/styles"
 example_repo: "https://github.com/swcarpentry/lesson-example"
 example_site: "https://swcarpentry.github.com/lesson-example"