diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index b303fd095d..996258b32d 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -248,7 +248,7 @@ GEM
       ethon (>= 0.9.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    unicode-display_width (1.5.0)
+    unicode-display_width (1.6.0)
     yell (2.1.0)
 
 PLATFORMS