diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index f9c8ff7..3dbe359 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
     execjs (2.7.0)
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.18)
+    ffi (1.12.2)
     forwardable-extended (2.6.0)
     gemoji (2.1.0)
     github-pages (98)