diff --git a/Gemfile.lock b/Gemfile.lock
index 920414a..896584b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,8 +13,8 @@ GEM
     colorator (0.1)
     execjs (2.3.0)
     fast-stemmer (1.0.2)
-    ffi (1.9.6)
-    ffi (1.9.6-x64-mingw32)
+    ffi (1.13.1)
+    ffi (1.13.1-x64-mingw32)
     hitimes (1.2.2)
     jekyll (2.5.3)
       classifier-reborn (~> 2.0)