diff --git a/_site/Gemfile.lock b/_site/Gemfile.lock
index e2be858..e99f832 100644
--- a/_site/Gemfile.lock
+++ b/_site/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
     colorator (0.1)
     execjs (2.5.2)
     fast-stemmer (1.0.2)
-    ffi (1.9.8)
+    ffi (1.15.4)
     gemoji (2.1.0)
     github-pages (38)
       RedCloth (= 4.2.9)