diff --git a/Gemfile.lock b/Gemfile.lock
index 9b9a87a02c02..a3ac480137cd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
       chunky_png (~> 1.2)
       fssm (>= 0.2.7)
       sass (~> 3.2.19)
-    ffi (1.9.18)
+    ffi (1.15.5)
     forwardable-extended (2.6.0)
     fssm (0.2.10)
     jekyll (3.5.2)