diff --git a/Gemfile.lock b/Gemfile.lock
index 0afecc2..052f77a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
       fssm (>= 0.2.7)
       sass (~> 3.2.19)
     fast-stemmer (1.0.2)
-    ffi (1.9.3)
+    ffi (1.15.5)
     fssm (0.2.10)
     highline (1.6.21)
     jekyll (1.4.3)