diff --git a/apps/epp_proxy/priv/test_backend_app/Gemfile.lock b/apps/epp_proxy/priv/test_backend_app/Gemfile.lock
index 60f7a6d..5dade24 100644
--- a/apps/epp_proxy/priv/test_backend_app/Gemfile.lock
+++ b/apps/epp_proxy/priv/test_backend_app/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     nio4r (2.5.2)
-    puma (4.3.1)
+    puma (4.3.3)
       nio4r (~> 2.0)
     rack (2.0.8)
     rack-unreloader (1.7.0)