diff --git a/Gemfile.lock b/Gemfile.lock
index 16a30a1..7998d71 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
     concurrent-ruby (1.0.5)
     ethon (0.11.0)
       ffi (>= 1.3.0)
-    ffi (1.9.18)
+    ffi (1.15.3)
     forwardable-extended (2.6.0)
     html-proofer (3.7.4)
       activesupport (>= 4.2, < 6.0)