diff --git a/ext/draco/docs/Gemfile.lock b/ext/draco/docs/Gemfile.lock
index 8269f1a16..076f5fd5e 100644
--- a/ext/draco/docs/Gemfile.lock
+++ b/ext/draco/docs/Gemfile.lock
@@ -26,7 +26,7 @@ GEM
     execjs (2.7.0)
     faraday (0.15.0)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.23)
+    ffi (1.11.1)
     forwardable-extended (2.6.0)
     gemoji (3.0.0)
     github-pages (183)