diff --git a/03-working-with-data.html b/03-working-with-data.html
index c1107808..afa2f817 100644
--- a/03-working-with-data.html
+++ b/03-working-with-data.html
@@ -524,7 +524,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>The subject words/headings are divided up with the pipe ( | )
 character</li>
@@ -555,7 +555,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>The subject words/headings were previously delimited with the pipe (
 | ) character</li>
diff --git a/aio.html b/aio.html
index 6f2a9456..3cef1777 100644
--- a/aio.html
+++ b/aio.html
@@ -1055,7 +1055,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>The subject words/headings are divided up with the pipe ( | )
@@ -1092,7 +1092,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>The subject words/headings were previously delimited with the pipe (
diff --git a/instructor-notes.html b/instructor-notes.html
index df1482c5..53cf262b 100644
--- a/instructor-notes.html
+++ b/instructor-notes.html
@@ -398,7 +398,7 @@ <h2 id="making-a-handout">Making a handout<a class="anchor" aria-label="anchor"
 Carpentry Reference Page</a></li>
 <li><a href="https://github.com/LibraryCarpentry/lc-open-refine/blob/gh-pages/files/draft-instructor-notes.md" class="external-link">Instructor
 Draft Notes</a></li>
-<li><a href="https://www.meanboyfriend.com/overdue_ideas/wp-content/uploads/2014/11/Introduction-to-OpenRefine-handout-CC-BY.pdf" class="external-link">Introduction
+<li><a href="http://www.meanboyfriend.com/overdue_ideas/wp-content/uploads/2014/11/Introduction-to-OpenRefine-handout-CC-BY.pdf" class="external-link">Introduction
 to OpenRefine by Owen Stephens</a></li>
 </ul>
 <hr>
diff --git a/instructor/03-working-with-data.html b/instructor/03-working-with-data.html
index 920660f7..6d113337 100644
--- a/instructor/03-working-with-data.html
+++ b/instructor/03-working-with-data.html
@@ -525,7 +525,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>The subject words/headings are divided up with the pipe ( | )
 character</li>
@@ -556,7 +556,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>The subject words/headings were previously delimited with the pipe (
 | ) character</li>
diff --git a/instructor/aio.html b/instructor/aio.html
index 7d2d0f7b..f055bff0 100644
--- a/instructor/aio.html
+++ b/instructor/aio.html
@@ -1087,7 +1087,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>The subject words/headings are divided up with the pipe ( | )
@@ -1124,7 +1124,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>The subject words/headings were previously delimited with the pipe (
diff --git a/instructor/instructor-notes.html b/instructor/instructor-notes.html
index 9a76dfcf..783f8c9c 100644
--- a/instructor/instructor-notes.html
+++ b/instructor/instructor-notes.html
@@ -394,7 +394,7 @@ <h2 id="making-a-handout">Making a handout<a class="anchor" aria-label="anchor"
 Carpentry Reference Page</a></li>
 <li><a href="https://github.com/LibraryCarpentry/lc-open-refine/blob/gh-pages/files/draft-instructor-notes.md" class="external-link">Instructor
 Draft Notes</a></li>
-<li><a href="https://www.meanboyfriend.com/overdue_ideas/wp-content/uploads/2014/11/Introduction-to-OpenRefine-handout-CC-BY.pdf" class="external-link">Introduction
+<li><a href="http://www.meanboyfriend.com/overdue_ideas/wp-content/uploads/2014/11/Introduction-to-OpenRefine-handout-CC-BY.pdf" class="external-link">Introduction
 to OpenRefine by Owen Stephens</a></li>
 </ul>
 <hr>
diff --git a/md5sum.txt b/md5sum.txt
index 672f821c..da7b9bfe 100644
--- a/md5sum.txt
+++ b/md5sum.txt
@@ -16,7 +16,7 @@
 "episodes/11-using-arrays-transformations.md" "0a72814d1256acbed6a6113a741317c6" "site/built/11-using-arrays-transformations.md" "2023-06-27"
 "episodes/12-export-transformation.md" "aa6dd576a893a0870baa24611573e50b" "site/built/12-export-transformation.md" "2023-05-01"
 "episodes/13-looking-up-data.md" "b0d55624c30b2bbf8fad445b5937067f" "site/built/13-looking-up-data.md" "2023-08-28"
-"instructors/instructor-notes.md" "616df143615c98dd1ecf47653a358c3d" "site/built/instructor-notes.md" "2023-05-01"
+"instructors/instructor-notes.md" "c2dfd88f1e85cccb9cbe872530c534ac" "site/built/instructor-notes.md" "2023-11-21"
 "learners/discuss.md" "60c724559d15d89fc50c5418d87f9628" "site/built/discuss.md" "2023-10-20"
 "learners/reference.md" "be4b8a891809c85a625fff879855921a" "site/built/reference.md" "2023-05-01"
 "learners/setup.md" "d20bf1277270da7d59f7c580e8a5d74e" "site/built/setup.md" "2023-10-31"
diff --git a/pkgdown.yml b/pkgdown.yml
index 7b398497..0b2aca41 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 2.19.2
 pkgdown: 2.0.7
 pkgdown_sha: ~
 articles: {}
-last_built: 2023-11-21T00:25Z
+last_built: 2023-11-21T11:18Z