diff --git a/lib/mastodon/redis_configuration.rb b/lib/mastodon/redis_configuration.rb
index 5a096a1bf..3d739a2ac 100644
--- a/lib/mastodon/redis_configuration.rb
+++ b/lib/mastodon/redis_configuration.rb
@@ -57,39 +57,50 @@ class Mastodon::RedisConfiguration
   def setup_config(prefix: nil, defaults: {})
     prefix = "#{prefix}REDIS_"
 
-    url           = ENV.fetch("#{prefix}URL", nil)
-    user          = ENV.fetch("#{prefix}USER", nil)
-    password      = ENV.fetch("#{prefix}PASSWORD", nil)
-    host          = ENV.fetch("#{prefix}HOST", defaults[:host])
-    port          = ENV.fetch("#{prefix}PORT", defaults[:port])
-    db            = ENV.fetch("#{prefix}DB", defaults[:db])
-    name          = ENV.fetch("#{prefix}SENTINEL_MASTER", nil)
-    sentinel_port = ENV.fetch("#{prefix}SENTINEL_PORT", 26_379)
-    sentinel_list = ENV.fetch("#{prefix}SENTINELS", nil)
+    url      = ENV.fetch("#{prefix}URL", nil)
+    user     = ENV.fetch("#{prefix}USER", nil)
+    password = ENV.fetch("#{prefix}PASSWORD", nil)
+    host     = ENV.fetch("#{prefix}HOST", defaults[:host])
+    port     = ENV.fetch("#{prefix}PORT", defaults[:port])
+    db       = ENV.fetch("#{prefix}DB", defaults[:db])
 
     return { url:, driver: } if url
 
-    sentinels = parse_sentinels(sentinel_list, default_port: sentinel_port)
+    sentinel_options = setup_sentinels(prefix, default_user: user, default_password: password)
 
-    if name.present? && sentinels.present?
-      host = name
+    if sentinel_options.present?
+      host = sentinel_options[:name]
       port = nil
       db ||= 0
-    else
-      sentinels = nil
     end
 
     url = construct_uri(host, port, db, user, password)
 
     if url.present?
-      { url:, driver:, name:, sentinels: }
+      { url:, driver: }.merge(sentinel_options)
     else
-      # Fall back to base config. This has defaults for the URL
-      # so this cannot lead to an endless loop.
+      # Fall back to base config, which has defaults for the URL
+      # so this cannot lead to endless recursion.
       base
     end
   end
 
+  def setup_sentinels(prefix, default_user: nil, default_password: nil)
+    name              = ENV.fetch("#{prefix}SENTINEL_MASTER", nil)
+    sentinel_port     = ENV.fetch("#{prefix}SENTINEL_PORT", 26_379)
+    sentinel_list     = ENV.fetch("#{prefix}SENTINELS", nil)
+    sentinel_username = ENV.fetch("#{prefix}SENTINEL_USERNAME", default_user)
+    sentinel_password = ENV.fetch("#{prefix}SENTINEL_PASSWORD", default_password)
+
+    sentinels = parse_sentinels(sentinel_list, default_port: sentinel_port)
+
+    if name.present? && sentinels.present?
+      { name:, sentinels:, sentinel_username:, sentinel_password: }
+    else
+      {}
+    end
+  end
+
   def construct_uri(host, port, db, user, password)
     return nil if host.blank?
 
diff --git a/spec/lib/mastodon/redis_configuration_spec.rb b/spec/lib/mastodon/redis_configuration_spec.rb
index d14adf951..e36dcfba0 100644
--- a/spec/lib/mastodon/redis_configuration_spec.rb
+++ b/spec/lib/mastodon/redis_configuration_spec.rb
@@ -100,10 +100,27 @@ RSpec.describe Mastodon::RedisConfiguration do
         expect(subject[:url]).to eq 'redis://:testpass1@mainsentinel/0'
       end
 
+      it 'uses the redis password to authenticate with sentinels' do
+        expect(subject[:sentinel_password]).to eq 'testpass1'
+      end
+
       it 'includes the sentinel master name and list of sentinels' do
         expect(subject[:name]).to eq 'mainsentinel'
         expect(subject[:sentinels]).to contain_exactly({ host: '192.168.0.1', port: 3000 }, { host: '192.168.0.2', port: 4000 })
       end
+
+      context "when giving dedicated credentials in `#{prefix}REDIS_SENTINEL_USERNAME` and `#{prefix}REDIS_SENTINEL_PASSWORD`" do
+        around do |example|
+          ClimateControl.modify "#{prefix}REDIS_SENTINEL_USERNAME": 'sentinel_user', "#{prefix}REDIS_SENTINEL_PASSWORD": 'sentinel_pass1' do
+            example.run
+          end
+        end
+
+        it 'uses the credential to authenticate with sentinels' do
+          expect(subject[:sentinel_username]).to eq 'sentinel_user'
+          expect(subject[:sentinel_password]).to eq 'sentinel_pass1'
+        end
+      end
     end
 
     context 'when giving sentinels without port numbers' do
@@ -154,8 +171,6 @@ RSpec.describe Mastodon::RedisConfiguration do
           url: 'redis://localhost:6379/0',
           driver: :hiredis,
           namespace: nil,
-          name: nil,
-          sentinels: nil,
         })
       end
     end
@@ -188,8 +203,6 @@ RSpec.describe Mastodon::RedisConfiguration do
           url: 'redis://:testpass@redis.example.com:3333/3',
           driver: :hiredis,
           namespace: nil,
-          name: nil,
-          sentinels: nil,
         })
       end
     end
@@ -218,8 +231,6 @@ RSpec.describe Mastodon::RedisConfiguration do
         namespace: 'cache',
         expires_in: 10.minutes,
         connect_timeout: 5,
-        name: nil,
-        sentinels: nil,
         pool: {
           size: 5,
           timeout: 5,