diff --git a/Gemfile b/Gemfile
index 464b4cc..1b50a6b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -27,6 +27,6 @@ group :development do
 end
 
 group :production do
-  gem 'puma'
+  gem 'puma', '< 5'
   gem 'pg'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index c9cb822..e654a67 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -139,7 +139,7 @@ GEM
       method_source (~> 1.0)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    puma (5.0.2)
+    puma (4.3.6)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -223,7 +223,7 @@ DEPENDENCIES
   listen
   pg
   pry-rails
-  puma
+  puma (< 5)
   rails (~> 6.0.0)
   sass-rails
   spring