diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index a1c610c..f20800c 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     colorator (0.1)
-    ffi (1.9.10)
+    ffi (1.15.5)
     jekyll (3.0.2)
       colorator (~> 0.1)
       jekyll-sass-converter (~> 1.0)