diff --git a/real/memento/notetaker/Gemfile b/real/memento/notetaker/Gemfile
index 1c1fa6fa..9e3cc6ac 100644
--- a/real/memento/notetaker/Gemfile
+++ b/real/memento/notetaker/Gemfile
@@ -12,7 +12,7 @@ gem 'rails', '~> 5.2.0'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 1.1.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/real/memento/notetaker/Gemfile.lock b/real/memento/notetaker/Gemfile.lock
index e1261587..35c953c7 100644
--- a/real/memento/notetaker/Gemfile.lock
+++ b/real/memento/notetaker/Gemfile.lock
@@ -76,7 +76,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.0)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
@@ -85,7 +87,8 @@ GEM
     nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     pg (1.1.3)
-    puma (3.12.0)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.5)
     rack-cors (1.0.2)
     rack-test (1.1.0)
@@ -170,7 +173,7 @@ DEPENDENCIES
   jwt
   listen (~> 3.1.0)
   pg (~> 1.1.0)
-  puma (~> 3.0)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.2.0)
   sass-rails (~> 5.0)