diff --git a/Gemfile b/Gemfile
index 3d0baa5d..d6143544 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem "net-pop", require: false
 gem "net-smtp", require: false
 gem "pg", ">= 0.18", "< 2.0"
 gem "psych", "< 4"
-gem "puma", "~> 4.3"
+gem "puma", "~> 5.6"
 gem "rack-cors"
 
 # rails without actionmailbox because of memory bloat
diff --git a/Gemfile.lock b/Gemfile.lock
index 866e9e00..0c7fbc10 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -128,7 +128,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     psych (3.3.4)
-    puma (4.3.12)
+    puma (5.6.7)
       nio4r (~> 2.0)
     racc (1.6.2)
     rack (2.2.7)
@@ -265,7 +265,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   pry
   psych (< 4)
-  puma (~> 4.3)
+  puma (~> 5.6)
   rack-cors
   railties (~> 7.0.4.3)
   redis (~> 4.0)