diff --git a/Gemfile.lock b/Gemfile.lock
index 660be5a..9458a36 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
     fastercsv (1.5.5)
-    ffi (1.9.10)
+    ffi (1.15.5)
     hpricot (0.8.6)
     jekyll (3.1.1)
       colorator (~> 0.1)