diff --git a/server/serve/build/Gemfile.lock b/server/serve/build/Gemfile.lock
index 317f58754..ca2df5436 100644
--- a/server/serve/build/Gemfile.lock
+++ b/server/serve/build/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     commander (4.1.5)
       highline (~> 1.6.11)
     fast-stemmer (1.0.2)
-    ffi (1.9.3)
+    ffi (1.15.5)
     github-pages (10)
       RedCloth (= 4.2.9)
       jekyll (= 1.3.0)