diff --git a/Gemfile.lock b/Gemfile.lock
index a2372e0..0018d76 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,7 +4,7 @@ GEM
     asciidoctor (1.5.6.1)
     coderay (1.1.2)
     colorator (0.1)
-    ffi (1.9.18)
+    ffi (1.15.3)
     jekyll (3.1.6)
       colorator (~> 0.1)
       jekyll-sass-converter (~> 1.0)