diff --git a/Gemfile b/Gemfile
index 98bb738..467b5dc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -29,4 +29,4 @@ gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 gem "wdm", "~> 0.1.0" if Gem.win_platform?
 
 
-gem "html-proofer", "~> 3.15", ">= 3.15.3"
+gem "html-proofer", "~> 3.18", ">= 3.18.2"
diff --git a/Gemfile.lock b/Gemfile.lock
index e4c4b45..2109751 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,19 +1,19 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.7.0)
+    addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
     concurrent-ruby (1.1.7)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
-    ethon (0.12.0)
-      ffi (>= 1.3.0)
+    ethon (0.14.0)
+      ffi (>= 1.15.0)
     eventmachine (1.2.7)
-    ffi (1.14.2)
+    ffi (1.15.4)
     forwardable-extended (2.6.0)
-    html-proofer (3.18.2)
+    html-proofer (3.19.2)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogumbo (~> 2.0)
@@ -60,13 +60,13 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.5.0)
-    nokogiri (1.11.1)
-      mini_portile2 (~> 2.5.0)
+    mini_portile2 (2.6.1)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
-    nokogumbo (2.0.4)
+    nokogumbo (2.0.5)
       nokogiri (~> 1.8, >= 1.8.4)
-    parallel (1.20.1)
+    parallel (1.21.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
@@ -91,7 +91,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  html-proofer (~> 3.15, >= 3.15.3)
+  html-proofer (~> 3.18, >= 3.18.2)
   jekyll (~> 4.0.0)
   jekyll-feed (~> 0.12, >= 0.12.0)
   jekyll-paginate-v2 (= 3.0.0)