diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 7570509ee4..f55a2875fe 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -265,7 +265,7 @@ GEM
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
     racc (1.6.0)
-    rainbow (3.0.0)
+    rainbow (3.1.1)
     rake (13.0.6)
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)