diff --git a/Gemfile.lock b/Gemfile.lock
index 302dbe1..75ee765 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    puma (3.11.4)
+    nio4r (2.5.8)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.6)
     rack-contrib (2.1.0)
       rack (~> 2.0)