diff --git a/Gemfile b/Gemfile
index 813bc42..eca0c8c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,7 +17,7 @@ gem 'mini_magick', '~> 4.10.1'
 gem 'net-ldap', '~> 0.16.0'
 gem 'nokogiri', '~> 1.6', '>= 1.6.8'
 gem 'openssl', '~> 2.1', '>= 2.1.2'
-gem 'puma', '~> 4.3.5'
+gem 'puma', '~> 4.3.12'
 gem 'rack', '>= 2.2.3'
 gem 'rails', '~> 6.0.2', '>= 6.0.2.1'
 gem 'ruby-ldapserver', '~> 0.5.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index 74384b6..d4e8ef9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -145,7 +145,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.5)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_magick (4.10.1)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
@@ -158,7 +160,7 @@ GEM
     msgpack (1.3.3)
     nenv (0.3.0)
     net-ldap (0.16.3)
-    nio4r (2.5.4)
+    nio4r (2.5.8)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     notiffany (0.1.3)
@@ -172,7 +174,7 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (4.0.6)
-    puma (4.3.6)
+    puma (4.3.12)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-proxy (0.6.5)
@@ -302,7 +304,7 @@ DEPENDENCIES
   openssl (~> 2.1, >= 2.1.2)
   pg (~> 1.2.2)
   pry-rails
-  puma (~> 4.3.5)
+  puma (~> 4.3.12)
   rack (>= 2.2.3)
   rails (~> 6.0.2, >= 6.0.2.1)
   rails-controller-testing (~> 1.0.4)