diff --git a/Gemfile.lock b/Gemfile.lock
index 6522c90..59ede3e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     childprocess (0.5.6)
       ffi (~> 1.0, >= 1.0.11)
-    ffi (1.9.8)
+    ffi (1.13.1)
     headless (2.1.0)
     mini_portile (0.6.2)
     multi_json (1.11.0)