diff --git a/Gemfile.lock b/Gemfile.lock
index d504aa2..3dbd85d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,8 +14,8 @@ GEM
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.3)
     eventmachine (1.2.3-x64-mingw32)
-    ffi (1.9.17)
-    ffi (1.9.17-x64-mingw32)
+    ffi (1.11.3)
+    ffi (1.11.3-x64-mingw32)
     forwardable-extended (2.6.0)
     hawkins (2.0.5)
       em-websocket (~> 0.5)