diff --git a/_site/Gemfile.lock b/_site/Gemfile.lock
index 5b349df..6919e7b 100644
--- a/_site/Gemfile.lock
+++ b/_site/Gemfile.lock
@@ -4,7 +4,7 @@ GEM
     addressable (2.5.0)
       public_suffix (~> 2.0, >= 2.0.2)
     colorator (1.1.0)
-    ffi (1.9.17)
+    ffi (1.15.5)
     forwardable-extended (2.6.0)
     jekyll (3.3.1)
       addressable (~> 2.4)