diff --git a/Gemfile.lock b/Gemfile.lock
index 1af21ac..d0ee24d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
     colorator (0.1)
     execjs (2.4.0)
     fast-stemmer (1.0.2)
-    ffi (1.9.8)
+    ffi (1.15.5)
     gemoji (2.1.0)
     github-pages (33)
       RedCloth (= 4.2.9)