diff --git a/.github/workflows/test-docs-links.yml b/.github/workflows/test-docs-links.yml
index 33dc3f94..ff8188c6 100644
--- a/.github/workflows/test-docs-links.yml
+++ b/.github/workflows/test-docs-links.yml
@@ -63,6 +63,13 @@ jobs:
           BUNDLE_GEMFILE: ${{github.workspace}}/docs/GemFile
         run: bundle exec jekyll serve --detach
 
+      - name: HTML Proofer help
+        working-directory: docs
+        run: htmlproofer --help
+
+        # reminder, to get args info:
+        # gem install html-proofer
+        # htmlproofer --help
       - name: Test for broken URLs
         working-directory: docs
         run: |
diff --git a/docs/GemFile.lock b/docs/GemFile.lock
index 0367df37..a8e9f95a 100644
--- a/docs/GemFile.lock
+++ b/docs/GemFile.lock
@@ -21,7 +21,7 @@ GEM
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
     base64 (0.2.0)
-    bigdecimal (3.1.6)
+    bigdecimal (3.1.7)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -31,10 +31,9 @@ GEM
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
     cssminify2 (2.0.1)
-    dnsruby (1.70.0)
+    dnsruby (1.72.0)
       simpleidn (~> 0.2.1)
-    drb (2.2.0)
-      ruby2_keywords
+    drb (2.2.1)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
@@ -106,7 +105,7 @@ GEM
       nokogiri (>= 1.4)
     htmlcompressor (0.4.0)
     http_parser.rb (0.8.0)
-    i18n (1.14.1)
+    i18n (1.14.4)
       concurrent-ruby (~> 1.0)
     jekyll (3.9.5)
       addressable (~> 2.4)
@@ -242,11 +241,11 @@ GEM
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
-    minitest (5.22.2)
+    minitest (5.22.3)
     mutex_m (0.2.0)
     net-http (0.4.1)
       uri
-    nokogiri (1.16.2)
+    nokogiri (1.16.3)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     octokit (4.25.1)
@@ -262,7 +261,6 @@ GEM
       ffi (~> 1.0)
     rexml (3.2.6)
     rouge (3.30.0)
-    ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
     sass (3.7.4)