diff --git a/Gemfile.lock b/Gemfile.lock
index fdc5e1d..97f390c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     commander (4.1.6)
       highline (~> 1.6.11)
     fast-stemmer (1.0.2)
-    ffi (1.9.3)
+    ffi (1.15.1)
     highline (1.6.21)
     jekyll (1.4.3)
       classifier (~> 1.3)