diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 10578d7..16ec6ef 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,3 +26,12 @@ jobs:
           bundle exec jekyll build 2> error.log
           cat >&2 error.log
           ( ! grep -qie Error -e Warn error.log )
+      - name: HTMLProofer
+        run: |
+          # Check all links
+          bundle exec htmlproofer ./_site/\
+             --only-4xx\
+             --ignore-empty-alt=true\
+             --allow-hash-href=true\
+             --enforce-https=false\
+             --ignore-missing-alt=true
diff --git a/minutes/_posts/2016-06-06-may-9-2016.md b/minutes/_posts/2016-06-06-may-9-2016.md
index cd59156..174fc50 100644
--- a/minutes/_posts/2016-06-06-may-9-2016.md
+++ b/minutes/_posts/2016-06-06-may-9-2016.md
@@ -137,10 +137,7 @@ Delegate.
 ### Scala Center Proposals
 
 Proposal texts are in the
-[proposals](https://github.com/scalacenter/advisoryboard/tree/master/proposals)
-and
-[recommendations](https://github.com/scalacenter/advisoryboard/tree/master/recommendations)
-directory.  The latter directory is for accepted proposals.
+[proposals](https://github.com/scalacenter/advisoryboard/tree/main/proposals) directory.
 
 #### Proposal SCP-004: Clarification on how to write proposals
 
diff --git a/minutes/_posts/2016-08-09-august-9-2016.md b/minutes/_posts/2016-08-09-august-9-2016.md
index 53e3a8f..aabc40d 100644
--- a/minutes/_posts/2016-08-09-august-9-2016.md
+++ b/minutes/_posts/2016-08-09-august-9-2016.md
@@ -196,10 +196,7 @@ is already provided directly by EPFL.
 ### Scala Center Proposals
 
 Proposal texts are in the
-[proposals](https://github.com/scalacenter/advisoryboard/tree/master/proposals)
-and
-[recommendations](https://github.com/scalacenter/advisoryboard/tree/master/recommendations)
-directory.  The latter directory is for accepted proposals.
+[proposals](https://github.com/scalacenter/advisoryboard/tree/main/proposals) directory.
 
 #### Proposal SCP-001: Native Execution of Scala/Spark via LLVM
 
@@ -316,8 +313,7 @@ proposals, before the board has to vote. Heather agreed.
 Rami says SAP intends to submit proposals soon; Stu said the same of
 Twitter.
 
-Bill received a
-[meta-proposal](https://github.com/ensime/ensime.github.io/blob/e922e7cb3c06ee5f245083591315e8f564bfc343/contributing/center.md), from
+Bill received a meta-proposal from
 Sam Halliday from the ENSIME project, incorporating several topics
 around licensing and tooling.  That's the source of the next few
 agenda items (on the Scala license, the presentation compiler, and
diff --git a/minutes/_posts/2016-11-30-november-30-2016.md b/minutes/_posts/2016-11-30-november-30-2016.md
index 2f861ac..5eb1244 100644
--- a/minutes/_posts/2016-11-30-november-30-2016.md
+++ b/minutes/_posts/2016-11-30-november-30-2016.md
@@ -182,10 +182,7 @@ the board and towards the Center itself.
 
 The proposals themselves are not summarized here; see the proposal
 texts in the
-[proposals](https://github.com/scalacenter/advisoryboard/tree/master/proposals)
-and
-[recommendations](https://github.com/scalacenter/advisoryboard/tree/master/recommendations)
-directories on GitHub.  (The latter is for accepted proposals.)
+[proposals](https://github.com/scalacenter/advisoryboard/tree/main/proposals) directory.
 
 #### Proposal SCP-007: Collaborative redesign and implementation of Scala 2.13's collections library
 
diff --git a/minutes/ab-reports/2017-q4.md b/minutes/ab-reports/2017-q4.md
index 3307fe6..f3a4cbd 100644
--- a/minutes/ab-reports/2017-q4.md
+++ b/minutes/ab-reports/2017-q4.md
@@ -323,8 +323,8 @@ migrated non-commercial plugins that have an impact on the community:
 * [g8](https://github.com/foundweekends/giter8) in an sbt plugin that powers the `sbt new` command. It allows
   the creation of template to quickly create new projects. [PR #350](https://github.com/foundweekends/giter8/pull/350) ([@MasseGuillaume])
 
-* [sbt-aws-lambda](https://github.com/gilt/sbt-aws-lambda) is an sbt plugin that helps developer in
-  deploying code to AWS lambda. [PR #39](https://github.com/gilt/sbt-aws-lambda/pull/39) ([@Duhemm])
+* sbt-aws-lambda is an sbt plugin that helps developer in
+  deploying code to AWS lambda. PR #39 ([@Duhemm])
 
 * [sbt-spark-submit](https://github.com/saurfang/sbt-spark-submit) is an sbt plugin that makes it
   easy to submit jobs to spark, using spark-submit under the hood.