diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 251bc89d9e..b8a8a673c5 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -82,7 +82,7 @@ GEM
       octokit (~> 4.0)
       public_suffix (~> 2.0)
       typhoeus (~> 1.3)
-    html-pipeline (2.8.4)
+    html-pipeline (2.9.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     html-proofer (3.9.2)