diff --git a/Gemfile.lock b/Gemfile.lock
index 74bf5ae3..65699535 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -246,7 +246,8 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-cors (1.0.3)
     rack-protection (2.0.5)