diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index e423b54711b..46b0a820095 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
     colorator (0.1)
     execjs (2.2.1)
     fast-stemmer (1.0.2)
-    ffi (1.9.3)
+    ffi (1.13.1)
     jekyll (2.2.0)
       classifier (~> 1.3)
       colorator (~> 0.1)