diff --git a/Gemfile.lock b/Gemfile.lock
index 0a8f487..b504917 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
     colorator (0.1)
     execjs (2.2.1)
     fast-stemmer (1.0.2)
-    ffi (1.9.3)
+    ffi (1.15.1)
     jekyll (2.2.0)
       classifier (~> 1.3)
       colorator (~> 0.1)