diff --git a/engines/core/Gemfile.lock b/engines/core/Gemfile.lock
index f680f2a..95e1d29 100644
--- a/engines/core/Gemfile.lock
+++ b/engines/core/Gemfile.lock
@@ -91,7 +91,7 @@ GEM
     postgresql (1.0.0)
       pg
     racc (1.6.1)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.1.7)