diff --git a/Gemfile.lock b/Gemfile.lock
index 8b3df29..66d7cc1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -19,7 +19,7 @@ GEM
     execjs (2.6.0)
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.10)
+    ffi (1.15.0)
     gemoji (2.1.0)
     github-pages (75)
       RedCloth (= 4.2.9)