diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 7a07a3c4df..6d64553406 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 (2.9.0)
+    html-pipeline (2.9.1)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     html-proofer (3.9.2)