diff --git a/Gemfile.lock b/Gemfile.lock
index 0af5035..55397d8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
       public_suffix (~> 2.0, >= 2.0.2)
     colorator (1.1.0)
     diff-lcs (1.3)
-    ffi (1.9.18)
+    ffi (1.13.1)
     forwardable-extended (2.6.0)
     jekyll (3.5.2)
       addressable (~> 2.4)