diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index dc0dbc2..0b99d5a 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     colorator (1.1.0)
-    ffi (1.9.14)
+    ffi (1.15.0)
     forwardable-extended (2.6.0)
     jekyll (3.2.1)
       colorator (~> 1.0)