diff --git a/Gemfile b/Gemfile
index 498c558..38e9ce8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ source "https://rubygems.org"
 git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 gem 'rake', '~> 13.0.0'
-gem 'puma', '~> 4.3.0'
+gem 'puma', '~> 4.3.8'
 gem 'roda', '~> 3.33.0'
 
 gem 'i18n', '~> 1.8.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index 482eafb..8192b88 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -70,7 +70,7 @@ GEM
     jwt (2.2.1)
     method_source (1.0.0)
     minitest (5.14.1)
-    nio4r (2.5.2)
+    nio4r (2.5.7)
     oj (3.10.8)
     ougai (1.8.5)
       oj (~> 3.10)
@@ -82,7 +82,7 @@ GEM
     pry-byebug (3.9.0)
       byebug (~> 11.0)
       pry (~> 0.13.0)
-    puma (4.3.5)
+    puma (4.3.8)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-ougai (0.2.1)
@@ -137,7 +137,7 @@ DEPENDENCIES
   prometheus-client (~> 2.1.0)
   pry (~> 0.13.0)
   pry-byebug (~> 3.9.0)
-  puma (~> 4.3.0)
+  puma (~> 4.3.8)
   rack-ougai (~> 0.2.1)
   rack-request-id (~> 0.0.4)
   rack-test (~> 1.1.0)