diff --git a/.env.development b/.env.development
index 1a11e918ef..0629bf94ce 100644
--- a/.env.development
+++ b/.env.development
@@ -1,6 +1,7 @@
 LOCAL_DOMAIN=localhost
+ALTERNATE_DOMAINS=mastodon.internal
 
 DB_HOST=$(pwd)/data/postgres
 DB_USER=mastodon
 DB_NAME=mastodon_dev
-REDIS_URL=redis://$(pwd)/data/redis/redis-dev.sock
+REDIS_URL=unix://./data/redis/redis-dev.sock
diff --git a/.env.test b/.env.test
index e3706868ca..1cfc25119a 100644
--- a/.env.test
+++ b/.env.test
@@ -7,4 +7,4 @@ LOCAL_HTTPS=true
 DB_HOST=$(pwd)/data/postgres
 DB_USER=mastodon
 DB_NAME=mastodon_dev
-REDIS_URL=redis://$(pwd)/data/redis/redis-test.sock
+REDIS_URL=unix://./data/redis/redis-dev.sock
diff --git a/lib/mastodon/redis_config.rb b/lib/mastodon/redis_config.rb
index 98dc4788d1..11ae63c7a8 100644
--- a/lib/mastodon/redis_config.rb
+++ b/lib/mastodon/redis_config.rb
@@ -1,17 +1,36 @@
 # frozen_string_literal: true
 
+require 'pathname'
+
 def setup_redis_env_url(prefix = nil, defaults = true)
-  prefix = prefix.to_s.upcase + '_' unless prefix.nil?
+  prefix = "#{prefix.to_s.upcase}_" unless prefix.nil?
   prefix = '' if prefix.nil?
+  redis_url_key = "#{prefix}REDIS_URL"
 
-  return if ENV[prefix + 'REDIS_URL'].present?
+  if ENV[redis_url_key].present?
+    conn = +ENV["#{prefix}REDIS_URL"].sub(/redis:\/\//i, '')
 
-  password = ENV.fetch(prefix + 'REDIS_PASSWORD') { '' if defaults }
-  host     = ENV.fetch(prefix + 'REDIS_HOST') { 'localhost' if defaults }
-  port     = ENV.fetch(prefix + 'REDIS_PORT') { 6379 if defaults }
-  db       = ENV.fetch(prefix + 'REDIS_DB') { 0 if defaults }
+    # Strip any prefixing `unix://`
+    unix = !conn.sub!(/^unix:\/\//i, '').nil?
+    # Strip any prefixing `./`
+    unix |= conn.sub!(/^(\.\/)+/, '')
+    unix |= conn.start_with?('/')
 
-  ENV[prefix + 'REDIS_URL'] = begin
+    if unix
+      pn = Pathname.new(conn)
+      pn = Pathname.getwd / pn if pn.relative?
+      ENV[redis_url_key] = "unix://#{pn}"
+    end
+
+    return
+  end
+
+  password = ENV.fetch("#{prefix}REDIS_PASSWORD") { '' if defaults }
+  host     = ENV.fetch("#{prefix}REDIS_HOST") { 'localhost' if defaults }
+  port     = ENV.fetch("#{prefix}REDIS_PORT") { 6379 if defaults }
+  db       = ENV.fetch("#{prefix}REDIS_DB") { 0 if defaults }
+
+  ENV["#{prefix}REDIS_URL"] = begin
     if [password, host, port, db].all?(&:nil?)
       ENV['REDIS_URL']
     else
@@ -27,7 +46,7 @@ setup_redis_env_url(:cache, false)
 setup_redis_env_url(:sidekiq, false)
 
 namespace         = ENV.fetch('REDIS_NAMESPACE', nil)
-cache_namespace   = namespace ? namespace + '_cache' : 'cache'
+cache_namespace   = namespace ? "#{namespace}_cache" : 'cache'
 sidekiq_namespace = namespace
 
 REDIS_CACHE_PARAMS = {
diff --git a/streaming/index.js b/streaming/index.js
index cecb53ed5b..b09e7e6b6d 100644
--- a/streaming/index.js
+++ b/streaming/index.js
@@ -18,7 +18,7 @@ const env = process.env.NODE_ENV || 'development';
 const alwaysRequireAuth = process.env.LIMITED_FEDERATION_MODE === 'true' || process.env.WHITELIST_MODE === 'true' || process.env.AUTHORIZED_FETCH === 'true';
 
 dotenv.config({
-  path: env === 'production' ? '.env.production' : '.env',
+  path: env === 'production' || env === 'development' ? `.env.${env}` : '.env',
 });
 
 log.level = process.env.LOG_LEVEL || 'verbose';