diff --git a/Gemfile.lock b/Gemfile.lock
index 8a30b9a..5ab400c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -56,7 +56,7 @@ GEM
     html-pipeline (2.13.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    html-proofer (3.18.5)
+    html-proofer (3.18.6)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogumbo (~> 2.0)