diff --git a/web/documentserver-example/ruby/Gemfile.lock b/web/documentserver-example/ruby/Gemfile.lock
index a5879246..dc09465c 100644
--- a/web/documentserver-example/ruby/Gemfile.lock
+++ b/web/documentserver-example/ruby/Gemfile.lock
@@ -53,7 +53,7 @@ GEM
     debug_inspector (0.0.3)
     erubis (2.7.0)
     execjs (2.7.0)
-    ffi (1.9.18)
+    ffi (1.12.2)
     globalid (0.4.0)
       activesupport (>= 4.2.0)
     i18n (0.8.6)