diff --git a/Gemfile.lock b/Gemfile.lock
index 8b6363b..ae18a51 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,7 +43,7 @@ GEM
     erubis (2.7.0)
     eventmachine (1.0.4)
     execjs (2.7.0)
-    ffi (1.9.18)
+    ffi (1.13.1)
     haml (4.0.7)
       tilt
     hike (1.2.3)