diff --git a/Calculator/Gemfile.lock b/Calculator/Gemfile.lock
index 7ddef05..9bf2035 100644
--- a/Calculator/Gemfile.lock
+++ b/Calculator/Gemfile.lock
@@ -95,7 +95,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     public_suffix (3.0.0)
     puma (3.12.2)
-    rack (2.0.8)
+    rack (2.2.3)
     rack-test (0.7.0)
       rack (>= 1.0, < 3)
     rails (5.1.4)