diff --git a/Gemfile b/Gemfile
index f04f7969..4ead30a9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -88,7 +88,7 @@ end
 
 group :site do
   if ENV["PROOF"]
-    gem "html-proofer", "~> 2.0"
+    gem "html-proofer", "~> 3.4"
   end
 
   gem "jekyll-avatar"
diff --git a/script/proof b/script/proof
index 1dd63a28..664e778d 100755
--- a/script/proof
+++ b/script/proof
@@ -32,4 +32,4 @@ bundle exec jekyll build -s $SOURCE -d $DESTINATION --trace
 
 # 3.
 msg "Proofing..."
-time bundle exec htmlproof ./$DESTINATION --url-ignore $INGORE_HREFS $@
+time bundle exec htmlproofer ./$DESTINATION --url-ignore $INGORE_HREFS $@