diff --git a/Gemfile.lock b/Gemfile.lock
index c1580c3ae..1cbe8be6c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,28 +1,36 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    Ascii85 (1.1.0)
     activesupport (5.2.8)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
+    afm (0.2.2)
     algolia_html_extractor (2.6.4)
       json (~> 2.0)
       nokogiri (~> 1.10)
     algoliasearch (1.27.5)
       httpclient (~> 2.8, >= 2.8.3)
       json (>= 1.5.1)
+    async (2.3.1)
+      console (~> 1.10)
+      io-event (~> 1.1)
+      timers (~> 4.1)
     autoprefixer-rails (10.4.7.0)
       execjs (~> 2)
     chronic (0.10.2)
     colorator (1.1.0)
     concurrent-ruby (1.1.10)
+    console (1.16.2)
+      fiber-local
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
-    ethon (0.15.0)
+    ethon (0.16.0)
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
     execjs (2.8.1)
@@ -30,13 +38,15 @@ GEM
       forwardable-extended (~> 2.5)
     fastimage (2.2.6)
     ffi (1.15.5)
+    fiber-local (1.0.0)
     filesize (0.2.0)
     forwardable-extended (2.6.0)
-    html-proofer (4.3.2)
+    hashery (2.1.2)
+    html-proofer (5.0.4)
       addressable (~> 2.3)
-      mercenary (~> 0.3)
+      async (~> 2.1)
       nokogiri (~> 1.13)
-      parallel (~> 1.10)
+      pdf-reader (~> 2.11)
       rainbow (~> 3.0)
       typhoeus (~> 1.3)
       yell (~> 2.0)
@@ -45,6 +55,7 @@ GEM
     httpclient (2.8.3)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
+    io-event (1.1.6)
     jekyll (3.9.2)
       addressable (~> 2.4)
       colorator (~> 1.0)
@@ -109,20 +120,25 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.8.0)
+    mini_portile2 (2.8.1)
     minitest (5.15.0)
     nokogiri (1.13.8)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     nokogiri (1.13.8-x86_64-darwin)
       racc (~> 1.4)
-    parallel (1.22.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
+    pdf-reader (2.11.0)
+      Ascii85 (~> 1.0)
+      afm (~> 0.2.1)
+      hashery (~> 2.0)
+      ruby-rc4
+      ttfunk
     posix-spawn (0.3.15)
     progressbar (1.11.0)
-    public_suffix (4.0.7)
-    racc (1.6.0)
+    public_suffix (5.0.1)
+    racc (1.6.2)
     rack (2.2.4)
     rainbow (3.1.1)
     rb-fsevent (0.11.1)
@@ -130,6 +146,7 @@ GEM
       ffi (~> 1.0)
     rexml (3.2.5)
     rouge (3.29.0)
+    ruby-rc4 (0.1.5)
     safe_yaml (1.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
@@ -140,6 +157,8 @@ GEM
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     thread_safe (0.3.6)
+    timers (4.3.5)
+    ttfunk (1.7.0)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
     tzinfo (1.2.10)
@@ -148,7 +167,7 @@ GEM
     whenever (1.0.0)
       chronic (>= 0.6.3)
     yell (2.2.2)
-    zeitwerk (2.6.0)
+    zeitwerk (2.6.6)
 
 PLATFORMS
   ruby