diff --git a/Calculator/Gemfile.lock b/Calculator/Gemfile.lock
index 7ddef05..8d6b9d4 100644
--- a/Calculator/Gemfile.lock
+++ b/Calculator/Gemfile.lock
@@ -94,7 +94,7 @@ GEM
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.0.0)
-    puma (3.12.2)
+    puma (3.12.4)
     rack (2.0.8)
     rack-test (0.7.0)
       rack (>= 1.0, < 3)