diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 285397c..904cec5 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -4,7 +4,7 @@ GEM
     addressable (2.5.1)
       public_suffix (~> 2.0, >= 2.0.2)
     colorator (1.1.0)
-    ffi (1.9.18)
+    ffi (1.13.1)
     forwardable-extended (2.6.0)
     jekyll (3.5.0)
       addressable (~> 2.4)