diff --git a/Gemfile.lock b/Gemfile.lock
index 6d21d04..3a1cd2f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
       fssm (>= 0.2.7)
       sass (~> 3.1)
     fast-stemmer (1.0.2)
-    ffi (1.9.3)
+    ffi (1.15.5)
     fssm (0.2.10)
     highline (1.6.20)
     jekyll (1.3.1)