diff --git a/Gemfile.lock b/Gemfile.lock
index 7282e9e..1999729 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -23,7 +23,7 @@ GEM
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
     fast-stemmer (1.0.2)
-    ffi (1.9.10)
+    ffi (1.15.0)
     gemoji (2.1.0)
     github-pages (40)
       RedCloth (= 4.2.9)