diff --git a/Gemfile.lock b/Gemfile.lock
index ac657d9..f143f8d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -54,7 +54,7 @@ GEM
     eventmachine (0.12.10)
     execjs (1.4.0)
       multi_json (~> 1.0)
-    ffi (1.1.0)
+    ffi (1.15.0)
     guard (1.2.3)
       listen (>= 0.4.2)
       thor (>= 0.14.6)