diff --git a/Gemfile.lock b/Gemfile.lock
index d9544ee..823c617 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -19,7 +19,7 @@ GEM
     eventmachine (1.0.3)
     execjs (1.4.0)
       multi_json (~> 1.0)
-    ffi (1.2.0)
+    ffi (1.15.4)
     fssm (0.2.9)
     haml (3.1.7)
     hike (1.2.1)