diff --git a/Gemfile.lock b/Gemfile.lock
index 33a4193..454994d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
       public_suffix (~> 2.0, >= 2.0.2)
     backports (3.6.8)
     colorator (1.1.0)
-    ffi (1.9.18)
+    ffi (1.15.5)
     forwardable-extended (2.6.0)
     jekyll (3.4.0)
       addressable (~> 2.4)