diff --git a/encryptor_client/Gemfile b/encryptor_client/Gemfile
index ea0ca18..64828dd 100644
--- a/encryptor_client/Gemfile
+++ b/encryptor_client/Gemfile
@@ -13,7 +13,7 @@ gem 'bootsnap', '>= 1.4.2', require: false
 gem 'faraday', '~> 0.15.4'
 gem 'httpclient', '~> 2.8.3'
 gem 'oj'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # gem 'bcrypt', '~> 3.1.7'
 # gem 'image_processing', '~> 1.2'
 
diff --git a/encryptor_client/Gemfile.lock b/encryptor_client/Gemfile.lock
index c989ca1..fd34830 100644
--- a/encryptor_client/Gemfile.lock
+++ b/encryptor_client/Gemfile.lock
@@ -120,7 +120,9 @@ GEM
     mime-types (3.3)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0904)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.12.2)
@@ -140,7 +142,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (4.0.1)
-    puma (3.12.1)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-cors (1.0.3)
     rack-test (1.1.0)
@@ -250,7 +253,7 @@ DEPENDENCIES
   nio4r (~> 2.5)
   oj
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.0)
   rspec-rails (~> 3.8)