diff --git a/_site/Gemfile.lock b/_site/Gemfile.lock
index a741711..394462c 100644
--- a/_site/Gemfile.lock
+++ b/_site/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
     execjs (2.7.0)
     faraday (0.12.1)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.18)
+    ffi (1.15.0)
     forwardable-extended (2.6.0)
     gemoji (3.0.0)
     github-pages (142)